A large coil used as an electromagnet has a resistance of R = 450 and an

Question:

A large coil used as an electromagnet has a resistance of R = 450 Ω and an inductance of L = 2.47 H. The coil is connected to an ac source with voltage amplitude of 2.0 kV and a frequency of 9.55 Hz.
(a) What is the power factor?
(b) What is the impedance of the circuit?
(c) What is the peak current in the circuit?
(d) What is the average power delivered to the electromagnet by the source?