Question

The electrical energy required to heat a bucket of water to a certain temperature is 10 kWh. If heat losses, are 10%, the energy input is ____________

(a) 2.67 kWh

(b) 3 kWh

(c) 2.5 kWh

(d) 3.5 kWh

The question was asked in homework.

The question is from Advanced Problems on Application of Laplace Transform topic in division Application of the Laplace Transform in Circuit Analysis of Network Theory

Answer 1

Right choice is (a) 2.67 kWh

To elaborate: Given that, 10% of input is lost.

So, 0.90 Input = 10

Or, Input = \(\frac{10}{0.9}\) = 11.11 kWh.