EXERCISE

All of the following have the same units except:

• inductance.

• capacitive reactance.

• impedance.

• resistance.

A resistor is connected to an AC power supply. On this circuit, the current

• leads the voltage by 90°.

• lags the voltage by 90°.

• is in phase with the voltage.

• none of the given answers

A pure inductor is connected to an AC power supply. In this circuit, the current

• leads the voltage by 90°.

• lags the voltage by 90°.

• is in phase with the voltage.

• none of the given answers.

What is the phase angle between the voltages of the inductor and capacitor in a RLC series circuit?

• zero

• 90°

• 180°

• 270°

Which of the following diagrams is the correct phasor diagram for V_R, V_L and V?

• 
• 
• 
• 

Quantity of charge can be measured in

• time (s)

• Ampere (A)

• coulombs (C)

• Joule (J)

The formula for inductive reactance is

The equations for alternating emf and alternating current in a circuit containing capacitor are

What happens at resonance?

• Current is maximum

• Impedance is maximum

• Resistance is maximum

• Power factor is maximum

The power factor of an RLC circuit is defined as cos ∅ = R/Z, but the phase angle can also be calculated from ________.

• sin ∅ = (XL - XC)/Z

• sin ∅ = (XL - XC)/RZ

• sin ∅ = Z/(XL - XC)

• sin ∅ = RZ/(XL - XC)