40. A torch bulb is rated 2.5 V and 750 mA. Calculate (i) its power, (ii) its resistance and (iii) the energy consumed, if this bulb is lighted for four hours.
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Correct option is
A
1.87 ,3.33,27000
(1) Power is given by P=VI=2.5×0.75=1.875W
(2) Resistance is given by R=
I
V
=
0.75
2.5
=3.33Ω
(3) Time Given=4hr=4×60×60sec
=14400sec
Energy Consumed E=Pt
=1.875×14400
=27000J
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