KS3 - Resistance (animated)

KS3 - Resistance (follows Circuits 2)

Links to prior topics :
Basic physics,
Circuits 1,
Circuits 2,
PD/Current,
series,
parallel

Skills Developed:
Diagrams/graphical work,
physical to abstract,
logic,
problem solving.
Articulation,
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)

Practical Work/Demonstration
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]
Household/hobby electronics,
DT links,
Scientific inquiry


Overview:

Adding lights/ recall series or parallel
Comparison of heating system (water) and electrical circuit
Radiator/water model
Compare resistance / radiators

Keywords

Main Activity
Construct circuit
Get results for current.
Change resistor

Deduce ohms law VIR. Use triangle handout for scaffolding

See if they can infer laws before showing slide.

End question about modelling circuits - extension