A hot-water heater has an 8-ohm element that operates at 240 V. The power that's consumed by this water heater is A. 1,920 W. B. 30 W. C. 900 W. D. 7,200 W.

Question

Santos Mckenzie

Chemistry

23 January, 06:03

A hot-water heater has an 8-ohm element that operates at 240 V. The power that's consumed by this water heater is A. 1,920 W. B. 30 W. C. 900 W. D. 7,200 W.

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Answers (1)

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Kenneth Noble · Answer 1

the information provided is

Voltage - 240 V, Resistance - 8 Ω and we are asked to find power

equation for power is

Power = voltage x current

P = VI

we know the voltage yet we dont know the current, we can find the current using the following equation

voltage = current x resistance

V = IR

substituting the values

240 V = I x 8 Ω

I = 30 A

Power = 240 V x 30 A

Power = 7200 W

answer is D. 7200 W