This PowerPoint resource introduces middle school students to the concept of power, how it relates to energy transfer, and the financial cost of electricity usage. The lesson emphasizes practical applications and provides hands-on opportunities for students to perform calculations.
Key learning objectives:
- Defining power as the rate at which energy is transferred and understanding its unit, the watt (W).
- Calculating power using the formula: Power (W) = Energy (J) / Time (s)
- Converting between watts and kilowatts, and using these values to calculate the cost of electricity.
- Understanding how the power rating of devices affects their energy consumption and cost.
Resource features:
The lesson begins with a starter activity that revisits the concept of energy efficiency and explores energy transfer in everyday devices. Core topics include:
What is Power?
Explains power as energy transferred per second, with relatable examples like comparing two microwaves with different power ratings.
Energy and Power Calculations:
Step-by-step guidance on calculating power and energy usage, with examples such as light bulbs and kitchen appliances.
Watts and Kilowatts:
Covers unit conversions between watts and kilowatts, with practice questions to reinforce understanding.
Cost of Electricity:
Introduces the formula to calculate the cost of electricity:
Cost §=Power (kW)×Time (hours)×Cost per kWh §
Real-life scenarios, such as calculating the weekly cost of using a television, make the concept relatable.
Interactive activities include:
- Solving problems to calculate energy transfer and power.
- Completing tables to convert between units and analyze energy consumption.
- Calculating the cost of using various appliances based on provided power ratings and usage times.
The plenary consolidates learning by reviewing key calculations and discussing energy-saving tips to reduce electricity costs.
File details:
This editable ‘.pptx’ file aligns with middle school science curricula. It includes structured explanations, real-world examples, and practical tasks, making it an essential resource for teaching power, energy, and the cost of electricity.
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