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Question 15
Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to an electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

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Solution

Both the bulbs are connected in parallel.
Therefore, the potential difference across each of them will be 220 V, because no division of voltage occurs in a parallel circuit.
Current drawn by the bulb of rating 100 W is given by,
Power=Voltage×Current
Current=PowerVoltage=100220A
Current drawn by the bulb of rating 60 W is given by,
Power=Voltage×Current
Current=PowerVoltage=60220A
Hence, current drawn from the line =100220+60220=0.727A

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