Exam 9: Alternating Current

Frequency is measured in ____.

The RMS (root-mean-____) value is also called the ____ value.

The average value for a half-wave rectifier is the same as that of a full-wave rectifier.

The number of complete cycles that occur in one second is called the ____.

The most common of all AC waveforms is the ____ wave.

Each complete waveform of 360 degrees is called a ____.

A sine wave has a maximum voltage of 138 V. What is the voltage after 78 degrees of rotation?

Alternating current waveforms are the same regardless of how the current is produced.

A ____ permits voltage to be stepped up or down.

The most common frequency in the United States and Canada is 50 (Hz).

The sine wave reaches its peak positive voltage at ____ degrees.

Square waves are generally produced by electronic devices called ____.

The peak-to-peak value is measured from the maximum value in the positive direction to the maximum value in the negative direction.

The RMS value can be found by dividing the peak value by the square root of ____.

An AC sine wave with an RMS value of 120 V is connected to a full wave rectifier. What is the average DC voltage?

Average values of voltage and current are alternating current values.

A half-wave rectifier is connected to 277 V AC. What is the average DC voltage?

The pulses in pulsating direct current are often referred to as ____.

The peak value of a sine wave is one-____ of the peak-to-peak value.

A(n) ____ wave is one in which the voltage rises at a constant rate with respect to time.