Electricity, Magnetism and Electromagnetism

Which poles on the earth change?

• the North and South

• the magnetic poles

• the geographic poles

• the telephone poles

What is known as the difference between the earth's magnetic pole and its geographic pole?

• magnetic declination

• magnetic difference

• geographic decline

• geographic increase

As earth's magnetic poles move what happens to the magnetic declination of a given location

• it will always remain constant

• it will return to zero

• it will change

• it will always double

What type of current is produced in a battery

• induced

• magnetic

• alternating

• direct

What do electric generators do

• transform mechanical energy to electrical energy

• transform mechanical energy to sound

• transform electrical energy to mechanical energy

• transform electrical energy to potential energy

To reverse current direction in a motor the conducted current goes

• through the commutator to the armature

• through the armature

• through the brushes to the commutator

• in the direction of rotation

A plant generating electric current

• transmits alternating current at high voltages, but is used at low voltages

• transmits direct current at high voltages, but is used at low voltages

• transmits alternating current at low voltages, but used at high voltages

• transmits direct current at low voltages, but used at high voltages

What type of device converts mechanical energy into electrical energy?

• solenoid

• electric motor

• transformer

• generator

What type of device converts electrical energy into mechanical energy

• electric motors

• generator

• transformers

• galvanometer

The relationship between electricity and magnetism is called

• electrical energy.

• induced current.

• electromagnetism.

• ferromagnetism.

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