Question

A classroom is fitted with three tube lights of 40 watt each and two fans of 60 watt each. These are used for 8 hours per day. Calculate the total amount of electricity consumed in 30 days and find the cost of electricity used in one day, if the rate is ₹ 4 per unit​

Answer 1

number of tube lights=3

power consumption by each=40 watt

total power consumption by 3 tube lights=

40×3=120w

number of fans=2

power consumption by each=60 watt

total power consumption by 2 fans=60×2=120w

total power consumed=120+120=240w

electricity consumed on 1 day=240×3=720

electricity consumed on 30 days=720×30=21600w

rate for 30 days electricity consumption

=21600×4= Rs.66400

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