µ GCSE | Series & Parallel

10 quick questions - for GCSE or iGCSE



10 minutes maximum! (can you do it in 5?)  

Q1-3. Look at these 4 circuit diagrams:

Which of these...

1. ....will not work?

2. .... is a series circuit?

3. .....is a parallel circuit?


4. A student wants to add a switch to the circuit below to turn on bulb X but not bulb Y. Where should it go?

5. Which of these is in the right place to measure the current through bulb X?

6. The current through bulb X shown in Q5 was measure to be 2 amps. What will the current in bulb Y and the total current be?

Bulb Y Total current from cell
2 A 2 A
4 A 2 A
2 A 4 A
4 A 4 A


Q 7&8. Three identical bulbs, X, Y and Z are connected to a cell as shown.

7. Which has the largest current through it?

  • A. X
  • B. Y
  • C. Z
  • D. all have the same current

8. In the circuit above the cell has a voltage of 12V. The potential difference (p.d.) across each bulb will be:

  • A. X = 5V, Y = 4V, Z = 3V
  • B. X = 4V, Y = 4V, Z = 4V
  • C. X = 6V, Y = 6V, Z = 6V
  • D. X = 12V, Y = 12V, Z = 12V


9. Ammeters and voltmeters must be wired in ...

Ammeter Voltmeter
series series
series parallel
parallel series
parallel parallel


10. Here is another circuit built using identical bulbs that all light up, but not all at the same brightness.


Which of these bulbs will light up the brightest?