Exam 7: Alternating Current

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

The ____ value of an alternating current 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 moving through the magnetic field.

What is one example of negative power?

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

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

Current ____ voltage in an inductor.

Impedance is calculated by dividing ____ by ____.

What is the unit of measurement for inductance?

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

A noninductive coil has high ____ and no inductance.

The insulating material in a capacitor is called the ____.

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.

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