Problem 2. A torch bulb is rated at 2-5 V and 750 mA. Calculate its (i) power (ii) its
and in the energy consumed if the bulb is lighted for 4 hour.
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Explanation:
Magnetic Effects of Electric Current
Domestic Electric Circuit
A torch bulb is rated 2.5 V...
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Asked on December 30, 2019 by
Akshay Vyas
A torch bulb is rated 2.5 V and 750 mA. Calculate (i) its power (in J), (ii) its resistance (in Ω) and (iii) the energy consumed (in J) if this bulb is lighted for four hours.
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ANSWER
(1) P=VI=2.5×0.75=1.875W
(2) 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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