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Electronic Devices And Circuits
Network Theroms
Q
A battery has a short-circuit current of 30 A and an open circuit voltage of 24 V. If the battery is connected to an electric bulb of resistance 2 ohm-1, the power dissipated by the bulb is
AA. 80 w
BB. 1800 w
CC. 112.5 w
DD. 228 w
Correct Answer:
C. C. 112.5 w
Explanation:
r = Voc/Isc = 1.2 ohm Power used by bulb = (24 x 24) x 2/(1.2 + 2) x (1.2 + 2) or 11.5 Watt.