A bulb is rated 220 v -100 w what is resistance five such bulbs burns for 4 hours what is electrical energy consumed
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Vucucvu vivu आईबी iviv
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Using, P = V²R
we get R = V²P
= (200)²100
= 400
Energy consumed = P x t
= 100 x 4
= 400 Wh
= 0.4 kWh
Cost at the rate of 50 paise per unit
= Rs (0.50 x 0.4)
= Rs 2
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