AC Circuits Quiz

What is the property of a conductor by which a change in current creates a voltage in both the conductor itself and any nearby conductors?

• Conductance

• Capacitance

• Inductance

• Resistance

According to Lenz's law, what does a changing electric current through a circuit with inductance induce?

• No voltage change

• A proportional voltage that reinforces the change in current

• A proportional voltage that opposes the change in current

• A constant voltage regardless of the change in current

What is the unit of mutual inductance?

• Tesla

• Ohm

• Farad

• Henry

In an RL circuit, what is the characteristic time constant given by?

• R/L

• L/R

• R*C

• C/R

What is the phase difference between voltage and current in a circuit with an inductor?

• 180 degrees

• 90 degrees

• 45 degrees

• 0 degrees

What is the resonant frequency of an RLC series circuit?

• LC / 2π

• 1 / (2π√LC)

• 2π√LC

• 1 / (LC)

In an AC circuit with a capacitor, how does the current relate to the voltage?

• Current is out of phase by 180 degrees

• Current is in phase with voltage

• Current lags voltage by 90 degrees

• Current leads voltage by 90 degrees

What is the term for the opposition to the change in flow of current in an AC circuit due to inductance and capacitance?

• Reactance

• Conductance

• Impedance

• Resistance

What is the power factor in an RLC circuit?

• sinϕ

• cosϕ

• cotϕ

• tanϕ

What happens to the impedance at the resonant frequency in an RLC circuit?

• It becomes infinite

• It becomes zero

• It equals the reactance

• It equals the resistance