How will the amount of heat released in the spiral of an electric lamp change if both the current
| January 14, 2021 | education
How will the amount of heat released in the spiral of an electric lamp change if both the current in the lamp and the voltage across it are doubled?
Joule-Lenz law for the amount of heat released on a conductor:
Q = U * I * t
It can be seen from this that with an increase in both the current in the lamp and the voltage by 2 times, the amount of heat released will increase by 4 times:
Q2 / Q1 = [(2 * U) * (2 * I) * t] / (U * I * t) = 4.
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