Whenever a voltage or current passes through a series of changes, returns to the starting point, and then again starts the same series of changes, the series is called a __________.

The frequency is the number of __________ of AC per second (1 second).

The time required for a sine wave to complete one full cycle is called a __________.

The distance that a waveform travels during a period is commonly referred to as a __________.

An __________ of voltage or current is the induced voltage or current flowing at any instant during a cycle.

The __________ is the largest instantaneous value.

Statement 1. The largest single positive value occurs when the sine wave of voltage is at 90°,

and the largest single negative value occurs when it is at 270°.

      Statement 2.      Peak value is 1.41 times the effective value.

Regarding the above statements:

Effective value is also known as the __________ value or root mean square, which refers to the mathematical process by which the value is derived.

The effective value of a sine wave is actually a measure of the __________ of the sine wave.

When two waves, such as current and voltage are exactly in step with each other, they are said to be in __________.

When two waveforms go through their maximum and minimum points at different times, the two wave-forms are said to be __________ with each other.

The waveform that reaches its maximum or minimum value first is said to ______ the other waveform.

Most aircraft using a 24-volt DC system have special equipment that requires a certain amount of ______ AC current.

DC flows constantly in only one direction with a constant polarity, whereas AC current flow changes ______ at regular intervals.

Because more and more units are being operated electrically in airplanes, the power requirements are such that a number of advantages can be realized by using AC.

            1. Space and weight can be saved.

            2. Circuit breakers operate satisfactorily under load at high altitudes in an AC system, whereas arcing is so  

                excessive on DC systems that circuit breakers must be replaced frequently.    

            3. Most airplanes using a 24-volt DC system have special equipment that requires a

                certain amount of 250-cycle AC current.

When a conductor is moved through a magnetic field, an emf is induced in the conductor. The ______ can be used to determine the direction of the induced emf.

When a loop conductor is rotated in a magnetic field, a __________ is induced in each side of the loop.

Generators used to produce an alternating current are called __________.

The value of an induced emf depends on three factors:

1. Material the wire is made from,

2. Temperature of the wire,

3. 3. Number of wires moving through the magnetic field,

4. 4. Strength of the magnetic field,

5. 5.Length of the wire, and

6. 6. Speed of rotation

   Which three are correct?