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?

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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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