Practice # 6 AC Theory

Front

What is induced when a conductor is moved through a magnetic field?

Back

Electromotive force (EMF) is induced in the conductor.

Front

What does it mean when two waveforms are out of phase?

Back

It means that the two waveforms go through their maximum and minimum points at different times.

Front

What is the term for the induced voltage or current flowing at any instant during a cycle?

Back

Instantaneous value.

Front

What occurs at 90° and 270° in a sine wave of voltage?

Back

The largest single positive value occurs at 90°, and the largest single negative value occurs at 270°.

Front

What is the relationship between peak value and effective value in a sine wave?

Back

Peak value is 1.41 times the effective value.

Front

What is the effective value also known as?

Back

RMS (Root Mean Square) value.

Front

Define electromotive force (EMF).

Back

EMF is the voltage generated by a source, such as a battery or generator, that causes current to flow in a circuit.

Front

What is the difference between peak value and effective value?

Back

Peak value is the maximum voltage or current in a cycle, while effective value is the equivalent DC value that delivers the same power.

Front

What does RMS stand for in electrical terms?

Back

RMS stands for Root Mean Square, a statistical measure of the magnitude of a varying quantity.

Front

What is the significance of the phase relationship in waveforms?

Back

The phase relationship determines how waveforms interact, affecting interference, resonance, and overall system behavior.