AC Inductive Reactance and RL Circuits Quiz

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

• Voltage and current are out of phase by 180°

• Current leads voltage by 90°

• Voltage and current are in phase

• Voltage leads current by 90°

In a purely inductive circuit, how does the voltage relate to the current?

• Voltage lags current by 90°

• Voltage and current are out of phase by 180°

• Voltage leads current by 90°

• Voltage and current are in phase

How do you calculate the source voltage in an RL circuit using phaser diagrams?

• By subtracting the voltage across the inductor from the voltage across the resistor

• By using the Pythagorean theorem on the voltage triangle

• By multiplying the voltages across the resistor and inductor

• By adding the voltages across the resistor and inductor directly

What is the formula for calculating the current in an RL circuit?

• Current = Voltage of the source / Impedance

• Current = Voltage of the source * Impedance

• Current = Voltage of the source / Reactance

• Current = Voltage of the source / Resistance

What must you consider when using RMS or peak values in calculations?

• Using RMS values gives RMS current, and using peak values gives peak current

• Peak values are always larger than RMS values

• RMS values are always larger than peak values

• RMS and peak values can be used interchangeably

How is the phase angle in an RL circuit calculated?

• Using the cotangent function

• Using the tangent function

• Using the sine function

• Using the cosine function

What does the impedance in an RL circuit represent?

• Total opposition to current flow

• Total reactance only

• Total voltage drop

• Total resistance only

How is the impedance of an RL circuit calculated?

• Z = R - XL

• Z = R + XL

• Z = R * XL

• Z = √(R² + XL²)

In the impedance triangle, what does the opposite side represent?

• Resistance

• Voltage

• Inductive reactance

• Capacitive reactance

What is the relationship between the phase angle calculated using the voltage triangle and the impedance triangle?

• They are always the same

• They are supplementary

• They are always different

• They are complementary