Edexcel IGCSE Physics 2.9 Current Voltage Practical Questions

Circuit with symbols for ammeter, voltmeter, lamp and any power supply all correct.
Voltmeter in parallel with lamp.
Ammeter in series with lamp.
Correct means of varying voltage of lamp, e.g. variable power supply / rheostat / potentiometer.

Marking guidance:
- Variable power supplies or variable number of cells can be shown using labelled standard symbols.
- If no lamp in circuit, allow ammeter drawn in series with power supply.
- Allow variable resistor in series with lamp.

Any four from:
MP1. record ammeter and voltmeter reading
MP2. repeat readings for each voltage and find average
MP3. idea of changing the voltage / current
MP4. plot a graph of voltage and current
MP5. switch off current/circuit between readings

Marking guidance:
- Allow "measure voltage and current".
- Allow a described method that would change voltage or current, e.g. adding more cells or changing circuit resistance.
- Allow repeating experiment to find average.
- Ignore "let lamp cool between readings".