In which of the following cases more electrical energy is consumed per hour first a current of 1 ampere is passed through a resistance of 300 ohm second a current of 2 ampere is passed through a resistance of 100 ohms
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Answer: In second case, the energy consumption per hour is more
Explanation:
(a) R = 300 ohms, I = 1A, t = 1h
Power = I²R
= (1)² × (300)
= 1 × 300
= 300 Watts
Energy consumed = 300 × 1h
= 300 Watt/hour
(b) R = 100 ohm, I = 2A, time = 1h
Power = I²R
= (2)² × 100
= 400 watts
Energy consumed = 400 × 1h
= 400 watt/hour
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