A 40 watt bulb is used for 2.5 hours daily and 3 bulbs of 60 watts is used for 5 hours daily. Find the monthly bill (september) if the cost per unit is 75 paise?
Class 10 cbse science physics chapter 12- Electricity
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Explanation:BULB 1 = 40 w
BULB 2 = 60 w ( no. of bulbs is 3)
E = P x T
total energy used in 1 day= 40/1000 x 2.5 + 60/1000 x 3 x 5 = 1 KWH
total energy usage in september = 1 x 30 = 30 KWH
cost for usage = 30 x 75/100 = 2.25 rupees
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