Question

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1) A torch bulb is rated 3.0 V and 600 mA . Calculate its power ,
resistance and the energy cosumed if it is lighted for 5 hours .

Answer 1

We have V=IR

R= V/I

R= 3/0.6

R= 5 ohm.

now P= V.VR

P= 3*3*5 = 45 W

also Power= energy / time

E = P*T

E = 45*5*60*60 = 810000 Joules.

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