Question

Q.2
(a)
An electric heater consumes 15 Amp from a 120 volt source. It is operated on
the average of 5 hours perclay.
(10)
a) How much power does the heater use?
b) How much energy in KWh does it consume in 30 days?​

Answer 1

Explanation:

a) Power = potential difference x current = 120×15 W = 1800 W = 1.8 KW

b) energy used in 5 hrs = power × time = 1.8 × 5 KWh = 9 KWh

energy used in 30 days = 9 × 30 = 270 KWh

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