NCERT Question 15 - Chapter 12 Class 10 - Electricity

Last updated at May 29, 2023 by Teachoo

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

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NCERT Question 15 Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
Given
Potential difference = V = 220 V
Power of lamp 1 = P1 = 100 W
Power of lamp 2 = P2 = 60 W
We need to find current through the circuit
We know that
In parallel combination
current gets divided among the resistors
But,
Net current = Sum of current through individual resistors
I = I1 + I2
Finding current
We know that,
Power = Voltage × Current
P = V I
∴ I = 𝑃/𝑉
Lamp 1
I1 = 𝑃_1/𝑉
I1 = 100/220
I1 = 10/22
I1 = 5/11 A
Lamp 2
I2 = 𝑃_2/𝑉
I2 = 60/220
I2 = 6/22
I2 = 3/11 A
Net current
I = I1 + I2
I = 5/11 + 3/11
I = 8/11
I = 0.73 A
Net current through circuit is 0.73 A

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo

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