A 100 watt 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.

A 100 watt bulb is used for 5 hours daily and four 60 watt bulbs are u

1.	A 100 watt 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.
Answer» Solution :100 w = 100 joules PER second 1 watt hours = 3600 joules The electric bulb is lighted for 5 hours daily, `:.100Wxx5=500` watt hours 500 watt hours = 1800000 joules 1 kWh = 3600000 joules Units CONSUMED per DAY `=(1800000)/(3600000)=0.5` units Untis consumed in month `=0.5xx31=15.5` units.. . . . (1) Now, Sum of power of four 60 watt bulbs = 240 W 240 `Wxx5` hours = 1200 watt hours 1200 watt hours = 4320000 joules Energy consumed per day `= (4320000)/(3600000)=1.2` units Energy consumed in a month `=1.2xx31=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