Question

The electrical energy required to heat
a bucket of water to a certain
temperature is 4 kWh. If the heat losses
are 20 percent, the energy input is
(a) 2 kWh
(6) 3.2 kWh
(c) 5 kWh
(d) 6 kWh​

Answer 1

Answer:

b

Explanation:

20% of 4 is 0.8

hence 4-0.8= 3.2.....

Please Mark as brainliest

Answer 2

The input energy is 5 kWh.

Explanation:

The required energy to heat a bucket is E = 4 kWh

We have to calculate the input energy.

Let the input energy is Y.

as heat losses 20 %, then

  $Y-\frac{20Y}{100} =E=4kWh$

$\frac{100Y-20Y}{100} =4kWh$

$Y=\frac{400kWh}{80}$

Y = 5 kWh.

Thus, the energy input is 5 kWh.

#Learn More:

https://brainly.in/question/12365476