UNITS

3 marks · Normal

The table below shows measurements taken from different electrical devices.

For each device, calculate the power consumption. Write your answers with units.

(a)

Fan

[1 mark]

(b)

Lamp

[1 mark]

(c)

Heater

[1 mark]

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) 69 W

(b) 6.0 W

Common mistakes: incorrect multiplication; incorrect units

Show mark scheme and worked solution

Marking points

M1 (a) · 1 mark · Fan: correct calculation 230 × 0.30 = 69 W

M1 (b) · 1 mark · Lamp: correct calculation 12 × 0.50 = 6.0 W

M1 (c) · 1 mark · Heater: correct calculation 120 × 1.50 = 180 W

Worked solution

Fan: 230 × 0.30 = 69 W Lamp: 12 × 0.50 = 6.0 W Heater: 120 × 1.50 = 180 W