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21/07/2021 8:13 pm
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In which of the following cases more electrical energy is consumed per hour?
(i) A current of 1 ampere passed through a resistance of 300 ohms.
(ii) A current of 2 amperes passed through a resistance of 100 ohms.
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21/07/2021 8:23 pm
(i) R = 300 ohm, I = 1 A, t = 1 h
P = I2R = I2 x 300 = 300 W
E = P x t = 300 x 1 = 300 Wh
(ii) R = 100 ohm, I = 2A, t = 1h
P = I2R = 22 x 100 = 400 W
E = P x t = 400 x 1 = 400 Wh
Hence, in case (ii), the electrical consumed per hour is more.