10 minutes maximum! Can you do it in 5?

1. Electrical charge is measured in ...

  • A. amps
  • B. volts
  • C. ohms
  • D. coulombs

2. The formula to calculate charge is ...

  • A. charge = current x time
  • B. charge = current ÷ time
  • C. charge = current ÷ voltage
  • D. charge = voltage x current

3. When a charge flows along a wire in a circuit, the particles moving round are ..

  • A. electrons
  • B. protons
  • C. neutrons
  • D. atoms

What are the missing values in this table showing the charge flowing in a circuit?

  Charge Current Time
4. 20 A 5 s
5. 5 C 10 A
6. 400 C 4000 s
7. 200 mA 60 s

 
8. Power cables can carry high currents. power cables at sunset

What charge flows through a power cable if 30 amps flows through it in 10 seconds?

  • A. 3000 C
  • B. 300 C
  • C. 3 C
  • D. 0.33 C

9. A kettle needs a total charge of 1200 C to boil, in a time of 2 minutes. The current flowing in this time was:

  • A. 1 A
  • B. 10 A
  • C. 600 A
  • D. 144 kA
10. This circuit was switched on for a short time and 0.4 C of charge flowed. How long was it on for?
  • A. 200 seconds
  • B. 0.2 seconds
  • C. 0.8 seconds
  • D. 0.004 seconds