Exam 7: Series-Parallel Circuits

The purpose of a commutator in a dc generator is to:

Unlike magnetic poles repulse one another.

A ________ is a type of electromagnetic device that has a movable iron core called a plunger.

Applying an ac voltage to an electromagnetʹs coil will produce a ________.

In which one of the following applications is electromagnetism used?

The movable part of the relay is the:

Faradayʹs law and Lenzʹs law are related in that they deal with:

The magnetic term that is equivalent to voltage is ________.

An is a unit of ________.

If a basic one-loop, dc generator rotates at 60 revolutions each second, how many times each second does its dc output voltage reach a peak value?

Magnetic lines that are close to each other are said to have a high ________.

For a high current switching application where it is not practical to route heavy wiring to the switch location which device would be used?

The term reluctance in magnetic circuits is like the term ________ in electrical circuits.

Like magnetic poles ________.

A strong magnetic field around a conductor indicates a small current flowing through the conductor.

Reversing the current through an electromagnet ________ the magnetic field.

A tesla is a unit of ________.

The magnetic field around an electromagnet is produced by ________.

Faradayʹs law states that the voltage induced across a coil of wire is proportional to these two factors.

Increasing the speed at which a magnet moves through a coil of wire causes the induced voltage to ________.