Electricity
3 marks · EasyA kettle operates at 2000 W when supplied with a voltage of 250 V.
Calculate the current drawn by the kettle.
State how the electrical energy supplied to the kettle is transferred.
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.
Show answer
(a) 8 A
(b) It is transferred as thermal (heat) energy to the water and surroundings.
Common mistakes: Dividing voltage by power
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Uses I = P / V with appropriate values.
A1 (a) · 1 mark · Correct evaluation: 8 A. (follow-through)
B1 (b) · 1 mark · Correctly states the energy is transferred as heat/thermal energy.
Worked solution
a) I = P / V = 2000 W / 250 V = 8 A
b) The electrical energy is transferred as thermal energy to heat water and some to the kettle and surroundings.