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o) Two electric bulbss rated100 W: 220 V and 60 W; 220 V areconnected in parallel to an electric mains of 220 V. Find thecurrent drawn by the bulbs from the mains.OR) How will you infer with the help of an experiment that the samecurrent flows through every part of the circuit containing threeresistors R1, R2 and Rg in series connected to a battery of V volts?

Answer»

Since both lamps are connected in parallel hence the current will be divided based on their power rating.

For lamp 1 power is 100W= VI1

Here total pottential V = 220, and current

I = I1 + I2 .

I1= V/R1, I2= V/R2

Hence for 100= 220*220/R1

R1 = 484 ohm

Similarly R2 = 806.667 ohm.



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