6-5-3 Magnetism & Electricity

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How is a generator useful?

It uses magnetic force to create electricity

What is the difference between a generator and a motor?

A generator converts mechanical energy into electrical energy and a motor converts electrical energy into mechanical energy.

In an electromagnet, each section of the wire coil functions as a small separate conductor. How does this work to provide electric power?

The small currents of individual sections are added together to form one large current.

What is electric current?

a flow of energy in the form of charged particles

Mechanical energy is changed into electrical energy by which device?

a generator

What is a device used to convert mechanical energy into electrical energy called?

a generator

Which device changes mechanical energy into electrical energy?

a generator

Which device changes the mechanical energy into electrical energy?

a generator

What is created when electric current flows through the wire coil in an electromagnet?

a magnetic field

Mechanical energy in an electric motor is produced by an electromagnet which is connected to.....

a source of electric current

What type of device is created when a wire carrying an electric current is wrapped around an iron core producting a magnetic field?

an elecrtomagnet

How are magnetism and electricty related?

an electric current can produce a magnetic field

A magnet spinning around a stationary coil of wire forms....

an electric current in the wire

What is a machine that converts electric energy into mechanical energy called?

an electric motor

What type of device contains an electromagnet that rotates between the poles of a magnet?

an electric motor

A strong magnet that can be turned on and off is called....

an electromagnet

How are magnets and electricity all alike?

both have positive and negative forces

How does an electromagnet work?

by using electricity to make a magnet

What does a generator produce?

electrical energy

Why does the motor of a vacuum cleaner stop working when you unplug the cord? It no longer has a source of.....

electrical energy

What kind of energy transformation happens in an electric motor?

electrical energy is changed into mechanical energy

What happens in a motor running as part of an electric circuit?

electrical energy is changed to mechanical energy

In an electric motor, the energy transformation is from....

electrical to mechanical

The purpose of a generator at a power plant is to produce....

electricity

A coil of wires generates a magnetic field when a current is passed through it. What is this device called?

electromagnet

During a blackout, a hospital would lose its regular source of electical power. It would require another source of power. Which device could the hospital use in case of such an emergency?

generator

What uses magnetism to create electrical energy?

generator

Which type of device, found in power plants creates energy for homes?

generators

What would increasing the number of coils do to the strength of an electromagnet?

increase the strength

What makes an electromagnet more useful than an ordinary magnet?

it can be turned on and off

When two magnets are pulled together or pushed apart without touching, what force causes this response?

magnetic field

The purpose of an electic motor is to...

produce mechanical energy

When opposite poles of two magnets are close together....

they attract each other

When like poles of two magnets are close together.....

they repel each other

What is the role of a turbine in a power plant?

to convert mechanical energy into electrical energy

What is the purpose of the iron core in an electromagnet?

to make the magnetic field stronger


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