What is the voltage at the ends of a conductor if, when an electric current of 4 A passes through
| March 3, 2021 | education
What is the voltage at the ends of a conductor if, when an electric current of 4 A passes through it for 2 minutes, 192 kJ of heat is released?
I = 4 A.
t = 2 min = 120 s.
Q = 192 kJ = 192000 J.
U -?
According to the Joule-Lenz law, the amount of heat Q that is released in a conductor through which an electric current flows is determined by the formula: Q = I * U * t.
Where I is the current in the conductor, U is the voltage at the ends of the conductor, t is the time the electric current passes through the conductor.
U = Q / I * t.
U = 192000 J / 4 A * 120 s = 400 V.
Answer: the voltage at the ends of the conductor is U = 400 V.
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