1.

A torch bulb is rated 5V and 500mA. Calculate (i) its power, (ii) its resistance and (iii) the energy consumed if the bulb is lighted for 4 hours.

Answer»

SOLUTION :Here rating of TORCH bulb is V=5V and I=500mA =0.5A
(i) `therefore` POWER of torch bulb `P=VI= 5 times 0.5=2.5 W`
(ii) `therefore` RESISTANCE of torch bulb `R=V/l=5/0.5=10 Omega`
(iii) Energy consumed by the bulb in 4 hours.
`E=Pt =2.5 times 4=10 W H`


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