AC Circuits Basics Quiz

What does AC stand for in electrical engineering?

• Alternating Current

• Alternating Charge

• Alternating Capacitance

• Alternating Conductor

• Alternating Circuit

The frequency of AC in most household systems is:

Choose multiple correct answers

• 50 Hz

• 60 Hz

• 100 Hz

• 120 Hz

• 25 Hz

In an AC circuit, the direction of current flow:

• Remains constant

• Reverses periodically

• Depends on the voltage

• Is always from positive to negative

• Is random

The phase difference between voltage and current in a purely resistive AC circuit is:

• 0°

• 90°

• 180°

• 45°

• 270°

The unit of inductive reactance is:

• Ohm

• Henry

• Farad

• Siemens

• Volt

In a purely inductive AC circuit, the current:

• Leads the voltage by 90°

• Lags the voltage by 90°

• Is in phase with the voltage

• Leads the voltage by 180°

• Lags the voltage by 45°

The inductive reactance (X_L) is given by:

• X_L = 2 pi f L

• X_L = 1/(2 pi f L)

• X_L = L/(2 pi f)

• X_L = 1/L

• X_L = f/(2 pi L)

In a purely capacitive AC circuit, the current:

• Leads the voltage by 90°

• Lags the voltage by 90°

• Is in phase with the voltage

• Leads the voltage by 180°

• Lags the voltage by 45°

The unit of capacitive reactance is:

• Ohm

• Henry

• Farad

• Siemens

• Volt

The capacitive reactance (X_C) is given by:

• X_C = 2 pi f C

• X_C = 1/(2 pi f C)

• X_C = C/(2 pi f)

• X_C = 1/C

• X_C = f/(2 pi C)