# Question

(a) An inductor has a reactance of 90-Ω in a 60-Hz ac circuit. What is its inductance?

(b) What frequency would be required to double its reactance?

(b) What frequency would be required to double its reactance?

## Answer to relevant Questions

(a) Find the frequency at which a 250-mH inductor has a reactance of 400-Ω. (b) At what frequency would a 0.40μF capacitor have the same reactance? An inductor is connected to a variable-frequency ac voltage source. (a) If the frequency decreases by a factor of 2, the rms current will be (1) 2, (2) 1/2, (3) 4, (4) 1/4times the original rms current. Why? (b) If the rms ...A series RLC circuit has a resistance of 25-Ω, an inductance of 0.30 H, and a capacitance of 8.0μF. (a) At what frequency should the circuit be driven for the maximum power to be transferred from the driving source? (b) ...A small welding machine uses a voltage source of 120 V at 60 Hz. When the source is operating, it requires 1200 W of power, and the power factor is 0.75. (a) What is the machine’s impedance? (b) Find the rms current in ...A hair dryer is rated at 1200 W when plugged into a 120-V outlet. Find (a) Its rms current, (b) Its peak current, and (c) Its resistance.Post your question

0