Exam 7: Alternating Current

Three-phase systems provide voltages that are ____ electrical time degrees apart.

Impedance is calculated by dividing ____ by ____.

What is one example of negative power?

In a DC circuit, a capacitor allows the current to flow only until the charge on the capacitor is ____.

Vector diagrams, drawn to scale, can be used to determine average power values.

In a purely capacitive circuit, the current will lead the voltage by ____ degrees.

In mutual induction, there is an electrical connection between two or more coils.

A noninductive coil has high ____ and no inductance.

The insulating material in a capacitor is called the ____.

The amount of voltage produced by a coil rotating in a magnetic field depends upon the strength of the magnetic field.

The ease with which the voltage can be raised and lowered makes DC ideal for transmission purposes.

The ____ value of an alternating current is that value that will produce the same heating effect as a specific value of a steady direct current.

Electromagnetic induction can be accomplished in two different ways: by moving a magnetic field across a coil, or a coil through the magnetic field.

Current ____ voltage in an inductor.

What is the unit used to measure inductance?