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murtaza ali Grade: 10
        

a bulb is rated 40watt,220volts.it works 10hours a day and is connected to mains.if the mains have 200volts potential differencethen what is its energy consumption for a day?

7 years ago

Answers : (1)

Ramesh V
70 Points
										

power = V2/R


so, resistance of bulb = 220*220/40 = 1210 ohms


now its connected to 200V source


power consumed is P=V2/R = 200*200/1210 = 33W


energy consumption= p*t = 33*10 = 330 W-hr


                                                   = 0.33KW-hr


                  or 0.33 units


--


regards


Ramesh

7 years ago
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