the potential difference between the terminals of an electric heater is 80v when it draws a current of 4A from the source.what current will the heater draw if the potential difference is increased to 120v
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Answer:
The answer to this question is 6A
Explanation:
When potential difference was 80V, the current that was drawn was 4A.
Therefore resistance becomes
R = V/I
= 80V/4A
= 20Ω
We know that resistance of a conductor is always constant (given that physical conditions remain unchanged)
Therefore in the new case we have
Potential difference (V) = 120V
Resistance (R) = 20Ω
Therefore current becomes
I = V/R
= 120V/20Ω
= 6A
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