ELECTRICAL RESISTANCE
2 marks · EasyThe table shows the current for different voltages across a wire in an experiment:
| Voltage / V | Current / A |
|---|---|
| 1.0 | 0.2 |
| 2.0 | 0.4 |
| 3.0 | 0.6 |
Calculate the resistance of the wire using the data.
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5 Ω (±0.2)
Common mistakes: 0.5 Ω
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Marking points
M1 · 1 mark · Chooses a valid voltage/current pair and uses R = V/I.
A1 · 1 mark · Obtains correct value 5 Ω with correct units.
Worked solution
R = V / I. Using any pair, e.g. 1.0 V / 0.2 A = 5 Ω. (Check: 2.0 V / 0.4 A = 5 Ω, 3.0 V / 0.6 A = 5 Ω)