KS3 - Resistance (follows Circuits 2)
Links to prior topics :
physical to abstract,
relationships between values
Learning Objectives :
Revise PD, electrons and charge
To explain what effects resistance has on the current and PD in a circuit.
Using the concept of resistance to explain how a bulb can blow
Assessment Criteria for Objectives:
Comparison of models
Fill in analogous worksheet
Determine V=IR relationship from experiment
Teaching & Learning Strategies
Experimentation with circuits to practically determine the relationship of V=IxR
Resources / Materials Required
School circuit kit (cells, cables, switches, bulbs)
Ammeters, resistors (1kOhm & 10kOhm)
Lab Safety Considerations [CLEAPSS / Hazcards / COSHH]
Electrical safety (1.5-3v, IE negligible, but still worth pointing out)
Circuit creation – Battery + bulb + ammeter to measure, rope model of a circuit
Literacy /Numeracy/ICT incl. School-wide objectives
Numeracy links with voltage calculations,
literacy with the labels.
Other Broader/Cross-curricular links – [Citizenship, Sustainable Development, Scientific Inquiry, Critical Thinking, Articulation]
Adding lights/ recall series or parallel
Comparison of heating system (water) and electrical circuit
Compare resistance / radiators
Get results for current.
Deduce ohms law VIR. Use triangle handout for scaffolding
See if they can infer laws before showing slide.
End question about modelling circuits - extension