What this practice covers
These questions are drawn from past CIE 0625 Physics papers and filtered to electric circuits. 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 electric circuits, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying current is used up as it flows round a series circuit.
- Adding resistances in parallel instead of adding reciprocals.
- Forgetting the final reciprocal, so 1/R is quoted as R.
- Giving a parallel combined resistance larger than one of the resistors.
- Saying a thermistor's resistance rises with temperature.
- Saying an LDR's resistance rises in bright light.
- Assuming a parallel branch has a different voltage from the supply.
- Saying adding a lamp in parallel makes the others dimmer; it does not change their voltage.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Electric circuits revision notes.