AC Fundamentals - RL and RC

A series RC circuit has ∣V_R∣ = 12 V and ∣V_C∣ = 5 V. The magnitude of the supply voltage is:

• -7 V

• 7 V

• 13 V

• 17 V

At what frequency will the output voltage v_o(t) in

Fig be equal to the input voltage v(t) ?

• 0 rad/s

• 1 rad/s

• 4 rad/s

• ∞ rad/s

A 47 Ω resistor is in series with an inductive reactance of 120 Ω across an ac source. The impedance, expressed in polar form, is

• $47\angle68.6\degree$

• $120\angle68.6\degree$

• $129\angle31.4\degree$

• $129\angle68.6\degree$

The impedance of a capacitor increases with

increasing frequency.

• True

• False

When the frequency is decreased, the impedance of a parallel RL circuit Increases

• True

• False

The power consumed in a pure inductive circuit is ______

When the frequency is decreased, the impedance of a parallel RL circuit Increases

• True

• False

An AC voltage source supplies a 500Hz, 10V rms signal to a 2kΩ resistor in series with a 0.1µF capacitor as shown in figure. Find the total impedance.

• 3750.6 Ω

• 3760.6 Ω

• 3780.6 Ω

• 3790.6 Ω

An AC voltage source supplies a 500Hz, 10V rms signal to a 2kΩ resistor in series with a 0.1µF capacitor as shown in figure. Find the voltage across the capacitor in the circuit

• 7 V

• 7.5 V

• 8 V

• 8.5 V

Impedance is a complex quantity having the real part as _______ and the imaginary part as ______

• resistance, reactance

• reactance, resistance