Electric Theory

Multiple Choice

_________ is a type of energy that consists of charged particles, such as electrons.

• insulated

• conduction

• electron flow

• electricity

Multiple Choice

Electric current is the flow of electrons.

• true

• false

Open Ended

Name at least three common insulating materials.

Open Ended

What is the difference between conductors and insulators? (Please answer in at least two well-rounded sentences)

Multiple Choice

Electricity is predictable and follows a logical path called a(n) _____________.

• insulator

• conductor

• electric current

• circuit

Fill in the Blank

The part of the circuit that does the work is known as the ___________.

Fill in the Blank

Electrical current is measured in _____.

Multiple Choice

 _____ is the potential energy between two points along an electrical conductor.

• resistance

• watt

• amperes

• voltage

Fill in the Blank

The restriction of flow of electricity is known as ___________ and is measured in ohms.

Multiple Choice

1. Ohms are represented by the omega symbol. 

• true

• false

Open Ended

What does Ohm’s law define? What is the formula? (Answer in complete sentences)

Multiple Choice

The _____ is the standard unit of electric power it is the rate at which work is done.

• resistance

• watt

• amperes

• voltage

Match

Match the following

• 1. This type of bulb does not involve filaments it is initially more expensive but lasts longer than other types of bulbs

• 1. Type of bulb that functions by ionizing mercury vapor in a glass tube

• This type of bulb uses a tungsten resistor coil supported in a vacuum tube

• 1. Type of bulb that uses a tungsten filament encased inside a bulb much smaller than an incandescent bulb

light-emitting diode

flourescent

incandescent

halogen

• light-emitting diode

• flourescent

• incandescent

• halogen

Multiple Choice

1. Electricity is an efficient and economical source of heat for heating large, open spaces. 

• true

• false

Multiple Choice

A(n) _____ is any device that is used to interrupt the flow of electrons in a circuit, stopping or redirecting the flow of electricity.

• voltage detector

• conductor

• insulator

• switch

Multiple Choice

_____ switches have one common terminal and two opposing terminals that can connect to the common.

• 1. double-pole, single-throw

• single-pole, single-throw

• single-pole, double-throw

• split-phase, single-throw

Open Ended

1. Explain how a fuse is used to help prevent physical damage to electrical systems. 

Open Ended

What is one advantage of a circuit breaker over a fuse?

Multiple Choice

Ground fault circuit interrupters (GFCIs) are engineered to protect humans from electric shock.

• true

• false

Multiple Choice

1. Electricity supplied by power companies is direct current (DC). 

• true

• false

Multiple Choice

The number of cycles per second is an AC signal’s frequency, which is measured in units called _____.

• watts

• volts

• hertz

• amps

Multiple Choice

A(n) _____ is often included in electric cable as bare, noninsulated conductor.

• insulator

• breaker

• neutral conductor

• ground conductor

Multiple Choice

Three-phase power uses three hot conductors with three separate AC signals.

• true

• false

Multiple Choice

1. Electricity that flows in only one direction is called _____ current.

• direct

• alternating

• three-phase

• split-phase

Open Ended

Why do rechargeable batteries lose their ability to recharge over time?

Multiple Choice

1. Generators convert mechanical energy to DC electricity by moving a conductor through a magnetic field.

• true

• false

Multiple Choice

1. Solar power requires very few energy conversion devices in order to be useful on a large scale.

• true

• false

Open Ended

List four sources of electric power.