What this practice covers
These questions are drawn from past CIE 9702 Physics papers and filtered to electricity. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on electricity, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Naming the coulomb as the SI base unit rather than the ampere.
- Saying electrons flow from positive to negative, or that conventional current follows the electrons.
- Saying the drift velocity is smaller in a thinner wire.
- Defining e.m.f. as a force, or defining either quantity per unit time rather than per unit charge.
- Using P = I²R to compare parallel branches, or P = V²/R to compare components in series.
- Reading the resistance of a lamp as the gradient of its I-V curve.
- Saying a filament lamp is ohmic because its graph passes through the origin.
- Forgetting that equal mass with a longer wire means a smaller area as well.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Electricity revision notes.