Electrical Concepts - (39 Quetions)

What is an amplifier?

A device that increases signal strength.

The property of a circuit that opposes the flow of electrons is:

Resistance

Another name for a transistor is a:

Transfer resistor

What is a transistor made of?

Semiconductive material

In a typical neon lamp, what results in the tip turning blue?

The neon bulb emits light because current flows through the neon gas.

Which of the following converts light energy into electrical energy?

Photoelectric cell

When measuring resistance with an ohmmeter, you should:

Disconnect the power.

When wire conductors are coated with solder, the process is called:

Tinning

What is the type of resistance in an AC transmitter circuit?

Capacitance

Power lines carry what type of current?

Alternating current (AC)

In order to make an electric current flow, it is necessary to have:

A difference of potential

The part that revolves in the motor of a generator is called the:

Armature

What does the shaft in a generator do?

Carries the rotation and mechanical power.

What does the brush assembly in a generator do?

Transfers electrical current to and from the rotating part.

What does the bearing in a generator do?

Supports the rotating shaft and reduces friction.

To make permanent electronic connections, use a:

Soldering iron

Silicon chips are primarily used in:

Integrated circuits. Silicon is a semiconductor, used in chips such as computer processors and microprocessors.

Semiconductors that convert electrical current into light are:

LEDs — light-emitting diodes

What is a CFL, and how does it work?

A compact fluorescent lamp. It uses gas discharge plus phosphor.

How does a fluorescent lamp work?

Gas discharge plus phosphor.

Which device lowers current flow in a circuit?

Resistor

What property of metals lends them to be conductive materials?

The electrons in the outer shell are free to drift between atoms.

How many three-way switches would you use to control a hallway light from both ends of the hallway?

2

Which of these devices contains an electromagnet: a doorbell, a light bulb, a battery or a flashlight?

A doorbell.

A battery makes what type of current?

Direct current (DC)

A computer uses 300 W of power and operates for 10 hours. How many kilowatt-hours of energy does it consume?

3 kWh

When an outlet draws more amps than it is rated to handle, what happens?

The breaker for the circuit trips.

The capacity of a household electric circuit is commonly measured in units that describe its ability to deliver:

Current

The color strips on a resistor indicate the resistor's:

Value

What is an example of an electrostatic discharge?

A lightning bolt striking a tall building.

A switch stops the flow of electric current in a circuit by means of its:

Contacts

What tool is used to remove a module from an electronic assembly?

Chip puller

A variable resistor is commonly used to:

Adjust the volume of a radio.

A capacitor stores what type of energy?

Electrical energy

What device works by converting electricity into heat?

Resistor

Which part of a television is the output device?

The screen

Many home appliances and power tools are made safer by using:

Three-wire cords and plugs

When installing a household outlet, the green or bare wire attaches to:

The hexagonal head terminal screw (grounding)