A lamp rated $100 W$ at $22 V$ is connected to the main electric supply. What current is drawn from the supply line if the voltage is $220 V$ .

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Solution

Current in lamp is $p o w e r / v o l t a g e = 100 / 22 = 4.545 A m p$

Now as the voltage is becoming $22 / 220 = 1 / 10$ of the supply voltage so $c u r r e n t$ in bulb should be $10$ $t i m e s$ to that of supply line i.e., current in supply line $= 4.545 / 10 = 0.4545$ $A m p$

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A lamp rated 100W at 22V is connected to the main electric supply. What current is drawn from the supply line if the voltage is 220V.

Current in lamp is power/voltage=100/22=4.545AmpNow as the voltage is becoming 22/220=1/10 of the supply voltage so current in bulb should be 10 times to that of supply line i.e., current in supply line=4.545/10=0.4545 Amp

A lamp rated $100 W$ at $22 V$ is connected to the main electric supply. What current is drawn from the supply line if the voltage is $220 V$ .

Current in lamp is $p o w e r / v o l t a g e = 100 / 22 = 4.545 A m p$

Now as the voltage is becoming $22 / 220 = 1 / 10$ of the supply voltage so $c u r r e n t$ in bulb should be $10$ $t i m e s$ to that of supply line i.e., current in supply line $= 4.545 / 10 = 0.4545$ $A m p$