Chapter 4: Q44P (page 1046)
A large electromagnetic coil is connected to a 120-Hz ac source. The coil has resistance 400 Ω, and at this source frequency the coil has inductive reactance 250 Ω. (a) What is the inductance of the coil? (b) What must the rms voltage of the source be if the coil is to consume an average electrical power of 450 W?
Short Answer
a) Inductance of the coil is 0.33 H
b) Rms voltage of the source is 500.31 V