1.

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

Answer»

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Solution :(i) P= VI `=5xx0.5= 2.5 ` Watt
(ii) `R= (V)/(I)= (5)/(0.5) = 10 Omega`
(iii ) `W= P xxt = 2.5xx4 xx3600`
`=36000= 3.6 xx10^(4) J`


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