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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potential = 2.5v
current = 3/4 A
Power= VI= 25/10×3/4
=15/8WATT
POWER=V^2R
=0.3 OHM
ENERGY =V^2T/R
=3×10^4JOULE
Explanation:
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