Calculate the electricity units for a month of 31 days, if the following devices are used as specified :
(a) 3 bulbs of 40 W for 6 hours.
(b) 4 tube lights of 50 W for 8 hours
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Explanation:
w = Watt × hours × days / 1000
w = ( 3× 40 ) × 6 × 31 / 1000
w = 120 × 6 × 31 / 1000
w = 22320 / 1000
w = 2232 / 100
w = 22.32 kwhAnswer
( b )
w = 4× 50 × 8 / 1000
w = 1600 / 1000
w = 1.6kwh Answer
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