How will the amount of heat change if the current strength in it increases by 2 times, and the voltage decreases by the same amount?

univerkov | November 27, 2020 | education

Condition:
I2 = 2 * I1.
U1 = 2 * U2.
To find :
Q2 / Q1 -?
Decision :
A = Q = U * I * t. – Joule-Lenz law.
Q2 / Q1 = (U2 * I2 * t) / (U1 * I1 * t) = (U2 * 2I1 * t) / (2U2 * I1 * t) – we reduce.
Hence it follows that the amount of heat will not change.
Answer: Will not change.

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