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Flashcards in Chapter 9 Deck (70)
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1

A device that supplies alternating current

AC power source

2

Electric current that reverses direction periodically usually 60 times per second

Alternating current
(AC)

3

Device used to measure the electrical current in a circuit

Ammeter

4

A unit of measure of the electrical current flow in an electrical circuit; similar to gallons of water flow in a pipe

Ampere (amp)

5

A machine component that rotates, slides, or oscillates. Bearings reduce friction between the motor's rotating and stationary parts

Bearing

6

A system of one or many electrical components that accomplish a specific purpose.

Circuit

7

An electrical component that opens a circuit and stops the flow of electricity when the current reaches unsafe levels.

Circuit breaker

8

Materials that have electrons that can break free from the flow more easily than the electrons of other materials.

Conductor

9

Electrical current that flows in a single direction through a conductor.

Direct current
(DC)

10

A large electrical switch used for isolation during system repairs and maintenance.

Disconnect

11

The flow of electrons from one point to another along a pathway called a conductor.

Electricity

12

Magnetism produced by an electric current.

Electromagnetism

13

Negatively charged particles that orbit the nucleus of an atom.

Electrons

14

A rotating blade inside a motor housing or casing that cools the motor by pulling air in through the shroud.

Fan

15

A structure that holds the internal components of a motor and motor mounts.

Frame

16

A device used to protect equipment and electrical wiring from overcurrent.

Fuse

17

A device that converts mechanical energy into electrical energy.

Generator

18

A motor that turns slightly slower than the supplied frequency and can vary in speed based on the amount of load.

Induction motor

19

Any substance that prevents the passage of heat, light, electricity, or sound from one medium to another. Insulators do not conduct electricity.

Insulator

20

The amount of torque necessary for a motor to overcome the resistance of the driven machine.

Load

21

An enclosure that houses the equipment for motor control, including isolation power switches, lockouts, fuses, overload protection devices, ground fault protection, and sometimes meters for current amps and voltage.

Motor control center
(MCC)

22

A measurement of resistance in electrical circuits.

Ohm

23

A device that converts AC voltage to DC voltage.

Rectifier

24

A material that is neither a conductor nor an insulator.

Semiconductor

25

A casing over the motor that allows air to flow into an around the motor.

Shroud

26

Electricity that occurs when a number of electrons build up on the surface of a material but have no positive charge nearby to attract them and cause them to flow.

Static electricity

27

A stationary part of the motor where the alternating current supplied to the motor flows, creating a magnetic field using magnets and coiled wire.

Stator

28

And electrical device used to start, stop, or otherwise reconfigure the flow of electricity in a circuit.

Switch

29

A motor that runs at a fixed speed that is synchronized with the supply of electricity.

Synchronous u

30

And electrical device that takes electricity of one voltage and changes it into another voltage.

Transformer