AC Circuit Analysis and Power Factor

A pure resistive circuit has a resistor of 100 ohms connected across an alternating voltage source with an RMS voltage of 100 volts. What is the RMS current in the circuit?

• 0.5 A

• 1 A

• 2 A

• 10 A

An LCR series circuit has an impedance of 100 ohms and is connected to an alternating voltage source with an RMS voltage of 100 volts. How does the average power consumed in this LCR circuit compare to a pure resistive circuit with 100 ohms resistance and the same RMS voltage?

• It is always the same.

• It is always higher.

• It is always lower.

• It can be the same or lower, depending on the resistive component.

In an LCR series circuit, which components consume average power?

• Only the inductor (L)

• Only the capacitor (C)

• Only the resistor (R)

• All three components (L, C, and R)

What is the average power consumed by a purely resistive AC circuit?

• P_avg = I_rms^2 * Z

• P_avg = I_rms^2 * R

• P_avg = V_rms * I_rms

• P_avg = 0

What does the power factor (cos φ) represent in an AC circuit?

• The total opposition to current flow.

• The ratio of resistance to impedance.

• The phase difference between voltage and current.

• The amount of reactive power.

What is the power factor for an AC circuit that contains only inductors or capacitors, with no resistance?

• 1

• 0

• Between 0 and 1

• Greater than 1

What is the power factor of an LCR series circuit at resonance?

• 0

• 0.5

• 1

• Undefined