The voltage across the rheostat is 120 V, its resistance is 500 ohms. Determine the amount of heat released

The voltage across the rheostat is 120 V, its resistance is 500 ohms. Determine the amount of heat released in the rheostat in 2 minutes.

According to the Joule-Lenz law, the amount of heat that is released on the rheostat can be calculated using the formula:
Q = U ^ 2 * t / R, where U is the voltage across the rheostat (U = 120 V), t is the current flow time (t = 2 min = 2 * 60 s = 120 s), R is the resistance of the rheostat (R = 500 Ohm).
Let’s calculate the amount of heat:
Q = U ^ 2 * t / R = (120 ^ 2) * 120/500 = 3456 J.
Answer: Heat will be released on the rheostat in the amount of 3456 J.