NCERT - Science

Book: NCERT - Science

Chapter: 12. Electricity

Subject: Physics - Class 10th

Q. No. 15 of Exercise-Pg-221

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

Given the power of the two lamps, we will calculate the resistances R1 and R2 of two lamps separately.

Now, The two lamps of resistances 484 and 806.7 are connected in parallel.

So, the combined resistance of two lamps can be calculated as follows:

Total resistance, R= 302.5

Current drawn from the line can now be calculated by using Ohm's law as follows:

Thus, the current drawn from the line is 0.72 A


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