Electricity
3 marks · EasyA heater is switched on for 10 minutes with a current of 2 A flowing through it. The voltage across it is 120 V.
Calculate the total charge that passes through the heater during this time.
State the SI unit for electric charge.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) 1200 C
(b) Coulomb (C)
Common mistakes: Using minutes instead of seconds for time
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Use Q = I × t and convert 10 minutes to 600 seconds.
A1 (a) · 1 mark · Calculate correct charge: 1200 C.
B1 (b) · 1 mark · Correctly state the unit of charge: coulomb (C).
Worked solution
a) Q = I × t = 2 A × 10 × 60 s = 2 × 600 = 1200 C.
b) The SI unit for charge is the coulomb (C).