Quiz on AC series and parallel circuit

In a purely resistive circuit, how are voltage and current related?

• Voltage and current are in phase

• Current leads voltage by 90°

• Voltage leads current by 90°

• Voltage lags current by 90°

In a pure inductive circuit, how does current behave in relation to voltage?

• Current is in phase with voltage

• Current lags voltage by 90°

• Current leads voltage by 90°

• Current is equal to voltage

In a purely capacitive circuit, how does current behave in relation to voltage?

• Current lags voltage by 90°

• Current leads voltage by 90°

• Current is equal to voltage

• Current is in phase with voltage

What is the formula for inductive reactance?

• XL = R - jXC

• XL = 2πfL

• XL = 1 / (2πfC)

• XL = R + jXL

What does the impedance (Z) in a series R-L circuit represent?

• Z = R + jXL

• Z = R - jXC

• Z = R + jXC

• Z = R + jR

In a series R-L circuit, what is the phase angle (θ) if the power factor is cos θ?

• θ = -37.016°

• θ = 90°

• θ = 0°

• θ = 180°

What is the voltage drop across the resistor (VR) in a series R-L circuit?

• VR = I * XL

• VR = I * Z

• VR = I * XC

• VR = I * R

In a series R-C circuit, how is the voltage across the capacitor (VC) represented?

• VC leads VR by 90°

• VC is equal to VR

• VC lags VR by 90°

• VC is in phase with VR

What is the formula for capacitive reactance?

• XC = 1 / (2πfC)

• XC = 2πfL

• XC = R - jXL

• XC = R + jXL

In a parallel R-L circuit, how is the total current (IT) calculated?

• IT = IR / IL

• IT = IR + IL

• IT = IR - IL

• IT = IR * IL