1.

A tourch bulb is rated at 3 V and 600 mA. Calculate a) Power b) Resistance c) Energy consumed if it is used for 4 hour.

Answer»

Solution :`V=3V` and `I=600mA=600xx10^(-3)A`
(a) Power = VI
`=3xx600xx10^(-3)`
`=1800xx10^(-3)`
`=P=1.8` W (or watt.
(b) Resistance (R )`=(V)/(I)`
`=(3)/(600xx10^(-3))`
`R=5Omega`
(c ) Power (P) `=1.8" W and"`
Time = 4 hours `=4xx60xx60=14400` second
Energy consumed `E=Pxxt`
`=1.8xx14400`
`=25920` joules
`E=25.9KJ`


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