Question

An electric refrigerator rated 400w operates 8 hrs/day . Calculate the energy per day in kwh

Answer 1

Explanation:

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Answer 2

The energy per day in kwh is 3.2 kWh per day.

Given:

An electric refrigerator rated 400w operates 8 hrs/day.

To Find:

The energy per day in kwh.

Solution:

To find the energy per day in kwh, we will follow the following steps:

As we know,

The ratio of energy used or supplied per unit of time is known as power.

So,

$power = \frac{energy}{time}$

1 kwh = 1000w

And,

watt(w) is the unit of power.

Now,

$energy = power \times time$

$= 400 \times 8 = 3200wh \: per \: day = 3.2kwh \: per \: day$

Henceforth, the energy per day in kwh is 3.2 kwh per day.

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