Question
Asked Nov 27, 2019
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The energy required to power a light bulb is 20 W . On an average, the bulb is switched on for 4 hours per day. Calculate the amount of energy required in joules per month? Assume 30 days in one month.

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Expert Answer

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Step 1

The concept is used to solve the problem is forms of energy and energy conversion factors.

The capacity to do a work is called as the energy.

Eelctrical energy is the from of energy and it is created by flow of electrical charge.

The conversion factor of energy from watt to joule per second is as follows:

1W 1J/s
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1W 1J/s

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Step 2

The energy required to power a light is .

Convert the amount of energy required to power a light from watts to joules per second as follows:

1J/s
Amount of energy = 20 Wx-
1W
20 J/s
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1J/s Amount of energy = 20 Wx- 1W 20 J/s

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Step 3

The amount of energy in joule per second is 20 J/s.

In one day, the light is switched on for 4 h .

Calculate the amount of energy required in jole per month as follows:

...
J 3600s
x4
S 1hour
30 days
h
Amount of energy in J/ month 20 x-
1 day 1month
8.64 x10 J/month
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J 3600s x4 S 1hour 30 days h Amount of energy in J/ month 20 x- 1 day 1month 8.64 x10 J/month

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