alternating current

What is the total capacitance of a 40 microfarad capacitor in parallel with a 30 microfarad capacitor?

70 microfarads

If a circuit has both capacitance and resistance, how will the current lead?

By some angle between 0° and 90°

What is the voltage on each of the two capacitors of the same value in series?

Half

What is the current flow in a purely resistive AC circuit if the resistance is 8 ohms?

30A

What is the opposing force that an inductor presents to the flow of alternating current?

Inductive reactance

if a transformer has 200 turns in the primary, 100 terms of the secondary, and 240 V in the primary, what is the secondary?

120VAC

opening the secondary circuit of a current transformer under load will cause which danger?

induced high voltage

If a transformer has 150 turns in the primary, 300 turns in the secondary, and 240V, secondary?

480VAC

Opening the secondary circuit of a current transformer under load will cause which danger?

Induced high voltage

What is the step-up turns ratio of a transformer with 50 turns in the primary and 100 secondary?

1:2

What are transformer windings typically wrapped around?

Iron core

What is a device that uses electromagnetic induction to transfer electrical energy from

Transformer

What is the name for transformers in which the primary and secondary voltages are

unlike wound transformers

What is the step-up turns ratio of a transformer with 100 turns in the primary and 300 secondary?

1:3

What is the true power in a 2A series RL circuit with a 50 ohm resistor?

200W

According to the power triangle, which is true about apparent power?

Greater than the true power

What is the apparent power of an AC circuit with a source voltage of 120V and a total

720

If the time for one cycle is 0.02 seconds, what is the frequency?

50Hz

What is the frequency of an AC waveform that completes 25 cycles per half-second?

50Hz

What is one type of nonsinusoidal waveform?

Sawtooth wave

What is the approximate effective voltage value of a circuit that has a peak of 310V?

219V

What is the relationship of two sine waves if the vector diagram of two AC waveforms

Are 90° out of phase

What is the approximate peak voltage of a circuit that has an effective voltage of 120V

170V