Question

The energy stored in a coil is 108 J. The power dissipated instantaneously across the blades of switch after it is opened in 10 ms is ____________

(a) 108 W

(b) 1080 W

(c) 10800 W

(d) 108000 W

Answer 1

The correct answer is (c) 10800 W

To explain: Power dissipated instantaneously across the blades of the switch is given by,

Power, P = \(\frac{Energy}{Time}\)

Given that, Energy = 108 J and time = 10 X 10^-3

So, P = \(\frac{108}{10 X 10^{-3}}\) = 10800 W.