Five bulb each rated as 200V_100W burnt for 4 hours . What is the cost electricity consumed if the rate is 50 paise per unit
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The electricity required for all the bulbs to glow for 4 hrs. will be :-
5 * 4 * 100 * 0.5 / 1000 = Rs. 1
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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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