A coil and an inductance-free resistance R = 25 are connected in parallel to the ac mains.

Question:

A coil and an inductance-free resistance R = 25Ω are connected in parallel to the ac mains. Find the heat power generated in the coil provided a current I = 0.90 A is drawn from the mains. The coil and the resistance R carry currents I1 = 0.50 A and I2 = 0.60 A respectively.