Example 12.4 - Chapter 12 Class 10 - Electricity (Term 2)
Last updated at March 16, 2023 by Teachoo
The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 120 V?
Example 12.4 The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 120 V?
Potential difference = V = 60 V
Current = I = 4 A
By ohm’s law,
V = I R
𝑉/I = R
R = 𝑉/I
R = 60/4
R = 15 Ω
Now,
the potential difference is increased 120 V
We need to find current (I) drawn
Now,
Potential difference = V = 120 V
Resistance = 15 Ω
By ohm’s law,
V = I R
𝑉/I = R
I = 𝑉/R
I = 120/15
I = 8 A
Current through the heater is 8 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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