In which of the following cases ore 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.

(i) Here current (I) = 1 A, Resistance (R) = 300 ohm, time(t) = 1h

We know that


P = I2R = 12 x 300 = 300 W


E = P x t = 300 x 1 = 300 Wh


(ii) Here Current (I) = 2 A Resistance(R) = 100 ohm, time (t) = 1h


We know that


P = I2R = 22 x 100 = 400 W


E = P x t = 400 x 1 = 400 Wh


Hence, in case (ii), the electrical energy consumed per hour is more.


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