AC Circuits

The period of an ac wave, in seconds, is

Equal to 1 divided by the frequency in Hertz

An advantage of ac over dc in utility applications is the fact that

AC is easier to transform from one voltage to another.

If two perfect sine waves have the same frequency and the same phase, composite wave:

Is a sine wave with an amplitude equal to the sum between the amplitudes of the two input waves

Which of the following is not a valid unit for frequency?

megacycles

In a series RL circuit, 12 V is measured across the resistor, and 14 V is measured across the inductor. The peak value of the source voltage is

26 V

Series RLC voltage or impedance totals must be calculated by:

Adding vectors

What is the phase difference current in the capacitor and current in the resistor in a series RLC circuit?

0 degrees

If admittance is given by Y = G+jB, and the circuit is capacitive, then:

B is positive

Which of the following statements is false regarding admittance components?

In a capacitive circuit, the total admittance is negative.

What is the power factor in a pure inductive or capacitive circuit?

0

Which of the following statements is true about power in an AC circuit?

Apparent power is the combination of real and reactive power

The impedance at the resonant frequency of a series RLC circuit with L = 20 mH, C = 0.02 F, and R = 90 ohms is?

90 ohms

In a parallel RLC circuit at resonance, the impedance is:

maximum

For a series RLC circuit, excited by voltage v = 20sinwt. The values of R = 2 ohms, L = 1mH and C = 0.4 uF. The resonant frequency of the circuit is _____.

50 krad/s

At resonant frequency, the voltage across the capacitor is _____ the voltage across the inductor.

Equal to