AQA · GCSE · Combined Science · Higher

Current I, resistance R and potential difference V equation

Q02.3 1 mark

Use the Physics Equations Sheet to answer questions 02.3 and 02.4.

Write down the equation that links current $(I)$ , resistance $(R)$ and potential difference $(V)$ .

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Marking points

1 Give the equation $V = IR$ , or write potential difference = current × resistance.

Full-mark answer

$V = IR$

Why this answer loses marks

$I = VR$

This multiplies potential difference and resistance instead of dividing/rearranging from $V=IR$ .