Energy Transfers and Power (Electricity Topic)Quick View
BrainJar

Energy Transfers and Power (Electricity Topic)

(1)
Complete No-Prep lesson with exam questions, tasks and answers on Energy Transfers and Power for the Electricity Topic of AQA GCSE (9-1) Science / Physics. This lesson covers exam spec points 4.2.4.1 and 4.2.4.2 (Physics) or 6.2.4.1 and 6.2.4.2 (Combined Science). As a Secondary Science teacher, Deputy Headteacher, writer and examiner for many years I make high quality no-prep lessons so busy teachers can teach outstanding lessons without spending hours planning. This high quality lesson includes explanations, different types of in-lesson assessment (all with answers) and unique exam questions. My lessons are ideal for non-Physicists - as a Biologist who retrained as a Physics teacher I know how to take learners on a journey that builds up their understanding step by step, while still going into a lot of depth. The preview video shows a representative sample of slides from the resource so that you get a good idea of what it includes before you buy. What’s Included: • Starter / Do Now Activity • Explanation slides in “chunked” sections with animated diagrams. • Worked examples of calculations / questions. • Multiple questions in different question styles and difficulties - no need for worksheets. Each “chunked” explanation section typically includes a set of “learning check / quick questions” followed by a set of in-depth questions on the learning from that “chunk” of the lesson. All questions have answers. • Exam-style questions on the whole lesson at the end of the lesson- these are unique, based on real exam questions but not just copied from exam boards. • Answers for all questions • All easily editable to adapt to your teaching or to use in existing lessons. • Slightly humorous, at points, if you like that sort of thing. Learning objectives: Describe how domestic appliances transfer energy. Describe how the amount of energy an appliance transfers depends on its power and how long it is on for. Describe how work is done when charge flows in a circuit. Calculate the amount of energy transferred by electrical work using: E = P t E = Q V. Calculate power using P = V I P = I2 R The lesson was written for AQA GCSE Science / Physics but is very likely to be applicable to other exam specifications. Please leave a rating / review and all other feedback gratefully received!
Bundle: Static Electricity and Electric FieldsQuick View
BrainJar

Bundle: Static Electricity and Electric Fields

2 Resources
Two complete No-Prep lessons with exam questions, tasks and answers on Static Electricity (Static Charge and Electric Fields) for AQA GCSE (9-1) Physics, covering all of exam spec points 4.2.5.1 and 4.2.5.2. This mini bundle can be used with the following bundle so you have all the lessons for the Electricity Topic for GCSE Physics: https://www.tes.com/teaching-resource/resource-12660191 As a Secondary Science teacher, Deputy Headteacher, writer and examiner for many years I make high quality no-prep lessons so busy teachers can teach outstanding lessons without spending hours planning. These high quality lessons include explanations, different types of in-lesson assessment (all with answers) and unique exam questions. My lessons are ideal for non-Physicists - as a Biologist who retrained as a Physics teacher I know how to take learners on a journey that builds up their understanding step by step, while still going into a lot of depth. The preview videos show a representative sample of slides from the resources so that you get a good idea of what they include before you buy. What’s Included in each lesson: • Starter / Do Now Activity • Explanation slides in “chunked” sections with animated diagrams. • Multiple questions in different question styles and difficulties - no need for worksheets. Each “chunked” explanation section typically includes a set of “learning check / quick questions” followed by a set of in-depth questions on the learning from that “chunk” of the lesson. All questions have answers. • Exam-style questions on the whole lesson at the end of the lesson- these are unique, based on real exam questions but not just copied from exam boards. • Answers for all questions • All easily editable to adapt to your teaching or to use in existing lessons. • Slightly humorous, at points, if you like that sort of thing. The lessons were written for AQA GCSE Physics but are very likely to be applicable to other exam specifications. Please leave a rating / review and all other feedback gratefully received!
AAQ Pearson Applied Science- 3C: Electrical circuits and the transfer of energyQuick View
CarrieOTypesCornerShop

AAQ Pearson Applied Science- 3C: Electrical circuits and the transfer of energy

5 Resources
New for the AAQ Pearson Applied Science BTEC - teaching starting from 2025 A bundle containing the full specification of content for the topic C: Electrical circuits and the transfer of energy in Unit 3: Principle and Application of Physics The lesson order is as follows: • Electrical Circuits (23 slides) • Resistance (20 slides) • Power (22 slides) • Specific Heat Capacity (24 slides) • Specific Latent Heat (24 slides) A total of over 110 slides worth of content! All lessons follow a similar structure and design with: • Learning objectives and specification link • Recall starter activity with answers based on previous lesson • Explanation slides with clear concise diagrams - chunked in an easy to understand format • Variety of practice activities including exam questions, gap fills, differentiated questions etc. • Answers for all questions • All easily editable to adapt to your teaching or to use in existing lessons although all lessons are ready to go • Minimal printing - I understand how limited printing budgets are so printing is mostly restricted to small diagrams and reusable fact sheets. • The occasional fun and interesting fact.
Electricity: Circuits, Current, ChargeQuick View
BrainJar

Electricity: Circuits, Current, Charge

(1)
Electricity: Circuits, Current and Charge: a complete, no-prep PowerPoint lesson for AQA GCSE Physics and Combined Science (Trilogy), with exam questions, worked examples, tasks and answers – no worksheets needed. Covers all of AQA GCSE Physics 4.2.1.1 and 4.2.1.2 / Combined Science 6.2.1.1 and 6.2.1.2: circuit symbols and circuit diagrams, cells and batteries, current as the rate of flow of charge, why current needs a source of potential difference, current in series circuits, and calculations with Q = It. This is the first lesson in the electricity teaching sequence. It is also in my Electricity Topic Bundle (7 lessons), which covers the whole topic: https://www.tes.com/teaching-resource/bundle-electricity-in-circuits-topic-12660191 As a Secondary Science teacher, Deputy Headteacher, writer and examiner I make high quality no-prep lessons so busy teachers can teach outstanding lessons without spending hours planning. This high quality lesson includes explanations, different types of in-lesson assessment (all with answers) and unique exam questions. My lessons are ideal for non-Physicists - as a Biologist who retrained as a Physics teacher I know how to take learners on a journey that builds up their understanding step by step, while still going into a lot of depth. The preview video shows a representative sample of slides from the resource so that you get a good idea of what it includes before you buy. What’s Included: • Starter / Do Now Activity • Explanation slides in “chunked” sections with animated diagrams. • Worked examples of calculations / questions. • Multiple questions in different question styles and difficulties - no need for worksheets. Each “chunked” explanation section typically includes a set of “learning check / quick questions” followed by a set of in-depth questions on the learning from that “chunk” of the lesson. All questions have answers. • Exam-style questions on the whole lesson at the end of the lesson- these are unique, based on real exam questions but not just copied from exam boards. • Answers for all questions • All easily editable to adapt to your teaching or to use in existing lessons. • Slightly humorous, at points, if you like that sort of thing. Learning objectives: Draw and interpret circuit diagrams, including by using circuit symbols correctly. Describe the difference between a battery and a cell. Describe current as a flow of electrical charge and the size of the current as the rate of flow of electrical charge. Explain why current requires a source of potential difference. Explain why current has the same value at any point in series circuit. Recall and apply: Charge Flow (Q) = Current (I) x time (t) The lesson was written for AQA GCSE Science / Physics but is very likely to be applicable to other exam specifications. Please leave a rating / review and all other feedback gratefully received!
GCSE Electricity RevisionQuick View
gclaw95

GCSE Electricity Revision

(0)
Enough content for 2 lessons including: Starter on symbols and their units Series and parallel circuits recap Resistance of a wire recap Filament lamp IV curve recap Static charge recap True/False quiz Recap of all equations needed to memorise and a worksheet that tests ALL of the equations where the students have to decide which equation to use (complete with answers) White board quiz
Electricity: Resistors Ohm's LawQuick View
BrainJar

Electricity: Resistors Ohm's Law

(1)
Complete No-Prep lesson with exam questions, tasks and answers on Resistors and Ohm’s Law (ohmic and non-ohmic conductors, filament lamps, diodes, LDRs and thermistors) for AQA GCSE (9-1) Science / Physics. This is the third lesson in the teaching sequence. This lesson covers all of AQA GCSE Physics 4.2.1.4 / Combined Science 6.2.1.4 theory sections but does not give instructions, sample results etc for the required practical. As a Secondary Science teacher, Deputy Headteacher, writer and examiner for many years I make high quality no-prep lessons so busy teachers can teach outstanding lessons without spending hours planning. This high quality lesson includes explanations, different types of in-lesson assessment (all with answers) and unique exam questions. My lessons are ideal for non-Physicists - as a Biologist who retrained as a Physics teacher I know how to take learners on a journey that builds up their understanding step by step, while still going into a lot of depth. The preview video shows a representative sample of slides from the resource so that you get a good idea of what it includes before you buy. What’s Included: • Starter / Do Now Activity • Explanation slides in “chunked” sections with animated diagrams. • Worked examples of calculations / questions. • Multiple questions in different question styles and difficulties - no need for worksheets. Each “chunked” explanation section typically includes a set of “learning check / quick questions” followed by a set of in-depth questions on the learning from that “chunk” of the lesson. All questions have answers. • Exam-style questions on the whole lesson at the end of the lesson- these are unique, based on real exam questions but not just copied from exam boards. • Answers for all questions • All easily editable to adapt to your teaching or to use in existing lessons. • Slightly humorous, at points, if you like that sort of thing. Learning objectives: Describe that for some resistors resistance is constant as current changes, but for others resistance changes as current changes. Describe Ohm’s Law and what is meant by an ohmic conductor. Explain the shape of the current-potential difference graphs for fixed resistors, lamps, diodes. Describe how resistance changes with light or temperature in LDRs and thermistors, and their uses. The lesson was written for AQA GCSE Science / Physics but is very likely to be applicable to other exam specifications. Please leave a rating / review and all other feedback gratefully received!
Electricity: Current, Resistance and Potential DifferenceQuick View
BrainJar

Electricity: Current, Resistance and Potential Difference

(1)
Complete No-Prep lesson with exam questions, tasks and answers on Current, Resistance and Potential Difference for AQA GCSE (9-1) Science / Physics. The lesson covers all of AQA GCSE Physics 4.2.1.3 and a small part of 4.2.4.2 (energy transferred = charge flow x potential difference) because this helps to explain potential difference. This lesson is the second in the Electricity sequence and follows on from Circuits, Current and Charge. As a Secondary Science teacher and Deputy Headteacher for many years I make high quality no-prep lessons so busy teachers can teach outstanding lessons without spending hours planning. This high quality lesson includes explanations, different types of in-lesson assessment (all with answers) and unique exam questions. My lessons are ideal for non-Physicists - as a Biologist who retrained as a Physics teacher I know how to take learners on a journey that builds up their understanding step by step, while still going into a lot of depth. The preview video shows a representative sample of slides from the resource so that you get a good idea of what it includes before you buy. What’s Included: • Starter / Do Now Activity • Explanation slides in “chunked” sections with animated diagrams. • Worked examples of calculations / questions. • Multiple questions in different question styles and difficulties - no need for worksheets. Each “chunked” explanation section typically includes a set of “learning check / quick questions” followed by a set of in-depth questions on the learning from that “chunk” of the lesson. All questions have answers. • Exam-style questions on the whole lesson at the end of the lesson- these are unique, based on real exam questions but not just copied from exam boards. • Answers for all questions • All easily editable to adapt to your teaching or to use in existing lessons. • Slightly humorous, at points, if you like that sort of thing. Learning objectives: Explain what potential difference is and how we measure it. Apply the equation energy transferred = charge flow x potential difference to describe how potential difference relates to energy transfer. Explain what resistance is, what causes it and how we measure it. Describe how the current through a component depends on both resistance and potential difference, and that a greater resistance will result in a smaller current for any given potential difference. Apply the equation potential difference = current x resistance. The lesson was written for AQA GCSE Science / Physics but is very likely to be applicable to other exam specifications. Please leave a rating / review and all other feedback gratefully received!
Bundle: Energy TopicQuick View
BrainJar

Bundle: Energy Topic

9 Resources
Energy Topic Bundle: 9 complete, no-prep PowerPoint lessons covering all of AQA GCSE Physics 4.1 and Combined Science (Trilogy) 6.1, with **exam questions, worked examples, tasks and answers **– no worksheets needed. Covers energy stores and transfers, kinetic, elastic and gravitational potential energy, specific heat capacity, power, useful and wasted energy, thermal conduction and insulation, efficiency, and renewable and non-renewable energy resources, including the equations Ek = ½mv², Ee = ½ke², Ep = mgh, ΔE = mcΔθ, P = E/t, P = W/t and efficiency = useful output ÷ total input. As a Secondary Science teacher, Deputy Headteacher, writer and examiner for many years I make high quality no-prep lessons so busy teachers can teach outstanding lessons without spending hours planning. These high quality lessons include explanations, different types of in-lesson assessment (all with answers) and unique exam questions. My lessons are ideal for non-Physicists - as a Biologist who retrained as a Physics teacher I know how to take learners on a journey that builds up their understanding step by step, while still going into a lot of depth. The preview videos show a representative sample of slides from each resource so that you get a good idea of what it includes before you buy. Teaching Order Energy Stores and Transfers Kinetic, Elastic and Gravitational Potential Energy Specific Heat Capacity (please note this lesson is also included in the Particle Model of Matter topic bundle). Power (Energy Topic) Useful and Wasted Energy Thermal Conduction and Insulation Efficiency National and Global Energy Resources: Non-Renewables National and Global Energy Resources: Renewables Note: I have not written lessons for the Required Practicals. What’s Included in each lesson: • Starter / Do Now Activity • Explanation slides in “chunked” sections with animated diagrams. • Worked examples of calculations / questions.where applicable • Multiple questions in different question styles and difficulties - no need for worksheets. Each “chunked” explanation section typically includes a set of “learning check / quick questions” followed by a set of in-depth questions on the learning from that “chunk” of the lesson. All questions have answers. • Exam-style questions on the whole lesson at the end of the lesson- these are unique, based on real exam questions but not just copied from exam boards. • Answers for all questions • All easily editable to adapt to your teaching or to use in existing lessons. • Slightly humorous, at points, if you like that sort of thing. The lessons were written for AQA GCSE Science / Physics but are very likely to be applicable to other exam specifications. Please leave a rating / review and all other feedback gratefully received!
Energy and Electricity Project BookletQuick View
rubberchicken2

Energy and Electricity Project Booklet

(5)
This is a project booklet which pupils used to help them design a houes. They completed a project over a few weeks where they had to complete the tasks within the book and build a model house which was as energy efficient as possible. They then had to present their house to the class and were graded on their ability to present and explain their ideas scientifically. I did this with a year seven class who did struggle with a couple of bits but it can always be tweaked to suit.
Non-Renewable Energy ResourcesQuick View
BrainJar

Non-Renewable Energy Resources

(0)
Complete No-Prep lesson with exam questions, tasks and answers on Non-renewable Energy Resources for AQA GCSE (9-1) Science / Physics. This lesson covers the parts of AQA GCSE Combined Science 6.1.3 / GCSE Physics 4.1.3 relating to non-renewables (the next lesson covers renewable energy resources). As a Secondary Science teacher, Deputy Headteacher, writer and examiner for many years I make high quality no-prep lessons so busy teachers can teach outstanding lessons without spending hours planning. This high quality lesson includes explanations, different types of in-lesson assessment (all with answers) and unique exam questions. My lessons are ideal for non-Physicists - as a Biologist who retrained as a Physics teacher I know how to take learners on a journey that builds up their understanding step by step, while still going into a lot of depth. The preview video shows a representative sample of slides from the resource so that you get a good idea of what it includes before you buy. What’s Included: • Starter / Do Now Activity • Explanation slides in “chunked” sections with animated diagrams. • Multiple questions in different question styles and difficulties - no need for worksheets. Each “chunked” explanation section typically includes a set of “learning check / quick questions” followed by a set of in-depth questions on the learning from that “chunk” of the lesson. All questions have answers. • Exam-style questions on the whole lesson at the end of the lesson- these are unique, based on real exam questions but not just copied from exam boards. • Answers for all questions • All easily editable to adapt to your teaching or to use in existing lessons. • Slightly humorous, at points, if you like that sort of thing. The lesson was written for AQA GCSE Science / Physics but is very likely to be applicable to other exam specifications. Please leave a rating / review and all other feedback gratefully received!
National Grid (Electricity Topic)Quick View
BrainJar

National Grid (Electricity Topic)

(1)
Complete No-Prep lesson with exam questions, tasks and answers on the National Grid for the Electricity Topic of AQA GCSE (9-1) Science / Physics. This lesson covers all of AQA GCSE Physics 4.2.4.3 / Combined Science 6.2.4.3 Please note that this lesson is for the Electricity topic - there is a similar lesson on Transformers and the National Grid for GCSE Physics only in the Magnetism and Electromagnetism topic. As a Secondary Science teacher, Deputy Headteacher, writer and examiner for many years I make high quality no-prep lessons so busy teachers can teach outstanding lessons without spending hours planning. This high quality lesson includes explanations, different types of in-lesson assessment (all with answers) and unique exam questions. My lessons are ideal for non-Physicists - as a Biologist who retrained as a Physics teacher I know how to take learners on a journey that builds up their understanding step by step, while still going into a lot of depth. The preview video shows a representative sample of slides from the resource so that you get a good idea of what it includes before you buy. What’s Included: • Starter / Do Now Activity • Explanation slides in “chunked” sections with animated diagrams. • Worked examples of calculations / questions. • Multiple questions in different question styles and difficulties - no need for worksheets. Each “chunked” explanation section typically includes a set of “learning check / quick questions” followed by a set of in-depth questions on the learning from that “chunk” of the lesson. All questions have answers. • Exam-style questions on the whole lesson at the end of the lesson- these are unique, based on real exam questions but not just copied from exam boards. • Answers for all questions • All easily editable to adapt to your teaching or to use in existing lessons. Learning objectives: Describe the structure and purpose of the national grid. Describe the difference between step-up and step-down transformers and how each is used in the national grid. Explain why the national grid is an efficient way to transfer energy. The lesson was written for AQA GCSE Science / Physics but is very likely to be applicable to other exam specifications. Please leave a rating / review and all other feedback gratefully received!
Energy Resources KS3 Activate ScienceQuick View
ychebbout

Energy Resources KS3 Activate Science

(0)
Perfect lesson resource for KS3 Physics! A fully differentiated and resourced lesson that assists students in learning about the different ways electricity is generated. Students will describe the difference between renewable and non-renewable energy resources, explain how electricity is generated in a power station, and evaluate the use of different energy resources. The resource includes a detailed and engaging lesson PowerPoint with differentiated activities, worksheets, information sheets and quizzes for students to complete. This resource is part of the energy topic and has been created for the delivery of the Activate KS3 Science course. Also great for GCSE Science. Approx lesson time: 2 hrs Included in resource: 36 slide PowerPoint Presentation, Worksheets with answers included
Electricity and Magnetism (Activate KS3)Quick View
OuttheBoxScience

Electricity and Magnetism (Activate KS3)

8 Resources
KS3 new for the Activate 2 resource ‘Electricity and Magnetism’ Full lessons ready to use straight ‘out of the box’. You’ll struggle to find a set of as many planned lessons this cheap and of similar quality Similar structure to my other power points following the input - activity - review phasing Activities differentiated. Plenary sections for progress checking Clear learning objectives and outcomes Modern and engaging layout Little adaptation needed LESSONS: L1 CHARGING UP (STATIC ELECTRICITY) L2 CIRCUITS AND CURRENT L3 SERIES AND PARALLEL L4 POTENTIAL DIFFERENCE L5 RESISTANCE L6 MAGNETS AND MAGNETIC FIELDS L7 ELECTROMAGNETS L8 USING ELECTROMAGNETS Please leave constructive feedback :D
Electrical Currents and Energy TransferQuick View
OuttheBoxScience

Electrical Currents and Energy Transfer

(4)
New for the AQA GCSE Combined Trilogy unit ‘P5 Electricity in the Home’. Full lesson ready to use straight ‘out of the box’. Though designed for teachers to deliver (specialist and non-specialists), the lessons are structured in an intuitive way for students to navigate for independent/ remote learning/ homework covering missed content/recap Similar structure to my other power points following the input - activity - review phasing plenary sections for progress checking Clear learning objectives and outcomes Modern and engaging layout Little adaptation needed Covers an hour lesson of content matched to the specification 30 ppt slides Please give constructive feedback :D
Energy and electricityQuick View
stewstar73

Energy and electricity

7 Resources
15 hours revision on topics 1 and 2 of the combined syllabus. Lots of analysis and calculations. Past paper images with all new questions. Included are some calculations
Alternating Current & Mains ElectricityQuick View
BrainJar

Alternating Current & Mains Electricity

(1)
Complete No-Prep lesson with exam questions, tasks and answers on Alternating Current and Mains Electricity for AQA GCSE (9-1) Science / Physics. This lesson covers all of AQA GCSE Physics 4.2.3.1 and 4.2.3.2 / Combined Science 6.2.3.1 and 6.2.3.2. As a Secondary Science teacher, Deputy Headteacher, writer and examiner for many years I make high quality no-prep lessons so busy teachers can teach outstanding lessons without spending hours planning. This high quality lesson includes explanations, different types of in-lesson assessment (all with answers) and unique exam questions. My lessons are ideal for non-Physicists - as a Biologist who retrained as a Physics teacher I know how to take learners on a journey that builds up their understanding step by step, while still going into a lot of depth. The preview video shows a representative sample of slides from the resource so that you get a good idea of what it includes before you buy. What’s Included: • Starter / Do Now Activity • Explanation slides in “chunked” sections with animated diagrams. • Multiple questions in different question styles and difficulties - no need for worksheets. Each “chunked” explanation section typically includes a set of “learning check / quick questions” followed by a set of in-depth questions on the learning from that “chunk” of the lesson. All questions have answers. • Exam-style questions on the whole lesson at the end of the lesson- these are unique, based on real exam questions but not just copied from exam boards. • Answers for all questions • All easily editable to adapt to your teaching or to use in existing lessons. • Slightly humorous, at points, if you like that sort of thing. Learning objectives: Explain the difference between direct and alternating potential difference / current. Describe the features of mains electricity in the UK including the potential difference and frequency. Describe how mains electricity is connected to appliances including the purpose of each part of a three-core cable and a three pin plug. Describe the potential dangers of electricity and the purpose of safety features including fuses and earthing. The lesson was written for AQA GCSE Science / Physics but is very likely to be applicable to other exam specifications. Please leave a rating / review and all other feedback gratefully received!
Static ElectricityQuick View
BrainJar

Static Electricity

(0)
Complete No-Prep lesson with exam questions, tasks and answers on Static Electricity for AQA GCSE (9-1) Physics, covering exam spec point 4.2.5.1 (Static Charge). As a Secondary Science teacher, Deputy Headteacher, writer and examiner for many years I make high quality no-prep lessons so busy teachers can teach outstanding lessons without spending hours planning. This high quality lesson includes explanations, different types of in-lesson assessment (all with answers) and unique exam questions. My lessons are ideal for non-Physicists - as a Biologist who retrained as a Physics teacher I know how to take learners on a journey that builds up their understanding step by step, while still going into a lot of depth. The preview video shows a representative sample of slides from the resource so that you get a good idea of what it includes before you buy. What’s Included: • Starter / Do Now Activity • Explanation slides in “chunked” sections with animated diagrams. • Multiple questions in different question styles and difficulties - no need for worksheets. Each “chunked” explanation section typically includes a set of “learning check / quick questions” followed by a set of in-depth questions on the learning from that “chunk” of the lesson. All questions have answers. • Exam-style questions on the whole lesson at the end of the lesson- these are unique, based on real exam questions but not just copied from exam boards. • Answers for all questions • All easily editable to adapt to your teaching or to use in existing lessons. • Slightly humorous, at points, if you like that sort of thing. Learning objectives: Describe the production of static electricity through friction between insulators. Describe evidence that charged objects exert forces of attraction or repulsion on each other through a non-contact force. Explain how the transfer of electrons between objects can explain static electricity. The lesson was written for AQA GCSE Physics but is very likely to be applicable to other exam specifications. Please leave a rating / review and all other feedback gratefully received!
Energy and ElectricityQuick View
40106372

Energy and Electricity

(0)
This is a 10 slide Prezi Presentation on the topic Energy, suitable for KS3 and KS4. It covers; Types of energy Law of conservation Energy transfer Renewable and non-renewable energy Efficiency Electricity generation Prezi link is in attached word document Please rate and share!
Energy resources and electricity generationQuick View
Elanesque

Energy resources and electricity generation

(2)
Lesson covering the following learning objectives: Recall how a coal power station generates electricity Compare pros/cons of nuclear power (C/B) Explain why we need renewable energy sources (B) and evaluate their uses in generating electricity (A) Calculate the cost of electricity using the formula: Cost = energy used x time x cost per kWh