ELECTRICAL RESISTANCE
3 marks · NormalA piece of wire in a circuit has a current of 0.30 A flowing through it. The resistance of the wire is 18 Ω.
Calculate the voltage across the wire. Give your answer with the correct unit.
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5.4 \; \mathrm{V} V (±0.1)
Common mistakes: Multiplying wrong way round; using R/I
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Marking points
M1 · 1 mark · Uses correct equation V = I × R.
M2 · 1 mark · Substitutes correct values. (follow-through)
A1 · 1 mark · Correct voltage with unit: 5.4 V.
Worked solution