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 ( Q = I.t )
 B. charge = current ÷ time (Q = I/t )
 C. charge = current ÷ voltage (Q = I/V )
 D. charge = voltage x current ( Q = V.I )


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. 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



