Basics of AC Circuits

What does AC stand for in AC circuits?

• Direct Current

• Amplified Current

• Automatic Control

• Alternating Current

Which of the following is a characteristic of AC circuits?

• Unidirectional flow of current

• Alternating flow of current

• Steady flow of current

• Direct flow of current

What is the frequency of AC power in most countries?

• 25 Hz

• 40 Hz

• 50 Hz

• 60 Hz

What is the unit of measurement for AC voltage?

• volts (V)

• ohms (Ω)

• amperes (A)

• watts (W)

What is the phase difference between voltage and current in an AC circuit with purely resistive load?

• 180 degrees

• zero degrees

• 90 degrees

• 45 degrees

What is the phase difference between voltage and current in an AC circuit with purely inductive load?

• 0 degrees

• 180 degrees

• 45 degrees

• 90 degrees

What is the phase difference between voltage and current in an AC circuit with purely capacitive load?

• 45 degrees

• 180 degrees

• 90 degrees

• 0 degrees

What is the power factor of an ideal AC circuit?

• 0

• 10

• 2

• 1

What is the formula to calculate power in an AC circuit?

• P = VIcos(θ)

• P = V^2cos(θ)

• P = I^2R

• P = V^2/R

What is the formula to calculate impedance in an AC circuit?

• Z = R + jX

• Z = R / jX

• Z = R - jX

• Z = R * jX