Electricity is supplied to a school along a cable of total resistance 0.5(Omega) with the maximum current drawn from the mains as 100A. The maximum energy dissipated as heat for 1 hr is
-
A.
3.6 x 103J -
B.
5.0 x 103J -
C.
3.0 x 105J -
D.
1.8 x 107J
Correct Answer: Option D
Explanation
Elect. energy = I2Rt
= 100 x 100 x 0.5 x 3600
= 1.8 x 107J