Ohm’s law (V = I R)
AQA GCSE Physics calculation · part of the free Calculation Climb
Potential difference = current × resistance: V = I R. Volts (V), amps (A), ohms (Ω).
How to do it — step by step
- V = I R.
- Rearrange: I = V ÷ R, or R = V ÷ I.
Worked example
2 A flows through a 6 Ω resistor.
V = 2 × 6 = 12 V
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