Alternating Current Physics - Alternating Current

An AC source rated 100V (rms) supplies a current of 10A (rms) to a circuit. The average power delivered by the source:

1. Must be 1000W.
2. May be 1000W.
3. May be greater than 1000W.
4. May be less than 1000W.

In an AC series circuit, the instantaneous current is zero when the instantaneous voltage is maximum. Connected to the source may be a:

1. Pure inductor.
2. Pure capacitor.
3. Pure resistor.
4. Combination of an inductor and a capacitor.

The magnetic field energy in an inductor changes from maximum value to minimum value in 5.0ms when connected to an AC source. The frequency of the source:

1. 20Hz.
2. 50Hz.
3. 200Hz.
4. 500Hz.

Can the peak voltage across the inductor be greater than the peak voltage of the source in an LCR circuit?

What is the reactance of a capacitor connected to a constant DC source?

A transformer is designed to convert an AC voltage of 220V to an AC voltage of 12V. If the input terminals are connected to a DC voltage of 220V, the transformer usually burns. Explain.

The peak power consumed by a resistive coil, when connected to an AC source, is 80W. Find the energy consumed by the coil in 100 seconds, which is many times larger than the time period of the source.

Find the time required for a 50Hz alternating current to change its value from zero to the rms value.

A bulb rated 60W at 220V is connected across a household supply of alternating voltage of 220V. Calculate the maximum instantaneous current through the filament.

Consider the situation of the previous problem. Find the average electric field energy stored in the capacitor and the average magnetic field energy stored in the coil.