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A 100-watt electric bulb is used for 5 hours daily and four 60 watt bulbs are used for 5 hours daily. Calculate the energy consumed (in kWh) in the month of January.

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100 W = 100 joules per second 

1 watt hours = 3600 joules 

The electric bulb is lighted for 5 hours daily, 

100 W × 5 = 500 watt hours 

500 watt hours = 1800000 joules 

1 kWh = 3600000 joules

Units consumed per day = \(\frac{1800000}{3600000}\) = 0.5 units

Untis consumed in month = 0.5 × 31 = 15.5 units …. (1) 

Now, Sum of power of four 60 watt bulbs = 240 W 

240 W × 5 hours = 1200 watt hours 

1200 watt hours = 4320000 joules

Energy consumed per day =\(\frac{4320000}{3600000}\) = 1.2 units 

Energy consumed in a month = 1.2 × 31 = 37.2 units …. (2)

Total energy consumed in a month = 15.5 + 37.2 = 52.7 units 

1 unit = 1 kWh 

The energy consumed in the month of January = 52.7 kWh.

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