A. 11:1
B. 1:11
C. 12:11
D. 11:12

Correct Answer:

Option C = 12:11

Explanation

Power supplied = IE = 20 X 240 = 4800 W
Power dissipated = IV = 20 X 220 = 4400 W
(Power supplied)/Power dissipated = (4800 W)/4400 W
= (12)/11

SEE ALSO  A radio wave has a wavelength of 150m. If the velocity of radio waves is free spaces is 3 x 10^8 m/s, calculate the frequency of the radio wave.

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