AC Circuits Quiz

What is the frequency of standard household AC power in most countries?

• 50 Hz

• 60 Hz

• 120 Hz

• 240 Hz

Which component in an AC circuit primarily resists the flow of current?

• Capacitor

• Inductor

• Resistor

• Transformer

What is the phase difference between voltage and current in a purely resistive AC circuit?

• 0 degrees

• 90 degrees

• 180 degrees

• 270 degrees

In an AC circuit, what is the unit of measurement for power?

• Watts

• Volts

• Amperes

• Ohms

What is the reactance of an inductor in an AC circuit?

• Resistance to the flow of current

• Ability to store electrical energy

• Resistance to changes in current

• Ability to maintain a constant voltage

What is the unit of measurement for frequency in Hertz (Hz)?

• Cycles per second

• Volts per second

• Amperes per second

• Ohms per second

What is the purpose of a transformer in an AC circuit?

• To convert DC to AC

• To store electrical energy

• To step up or step down voltage

• To increase current flow

What is the formula for calculating the capacitive reactance (Xc) in an AC circuit?

• Xc = R / ω

• Xc = 1 / (2πfC)

• Xc = Lω

• Xc = V / I

In an AC circuit, the impedance of a series RLC circuit is calculated as:

• Z = R + Xc + Xl

• Z = R - Xc + Xl

• Z = R + Xc - Xl

• Z = R - Xc - Xl

What is the phase relationship between the current and voltage in a purely capacitive circuit?

• In phase

• Leading current

• Lagging current

• Opposite direction