Electricity and Magnetism

Which of the following statements best describes a Generator.

• A generator changes electrical energy to mechanical energy.

• electric current flowing through a wire wrapped around an iron core forms a generator

• a Machine that is used to make thermal and Chemical energy

• is a machine that produces an electric current when a coil of wire wrapped around an iron core is rotated near a magnet.

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Where can Electric motors get their source of electricity?

• the electromagnet is connected to a battery or other source of electric current.

• Electric motors get their energy from the sun

• Electric motors energy comes from the burning of fuels

• All of the above

Where is the energy for our houses obtained from?

• Electric motors at power plants produce electric energy for our homes

• Generators at power plants produce electric energy for our homes

• Electromagnets at power plants produce electric energy for our homes

• An electromagnet is connected to a battery or other source of electric current.

​ ​ (a)   is the best electrical conductor

• Copper Penny

• Plastic Tubing

• Glass Rod

• Cotton String

Electrons always travel from ​ (a)   objects to (b)   objects.

• negative

• positive

• neutral

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A(n) ​ (a)   has a negative charge. A(n) ​ (b)   has a positive charge, and a(n) ​ (c)   has a neutral charge.

• electron

• proton

• neutron

• AC

• DC

• conductor

• insulator

• current

• voltage

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​ (a)   is the flow of an electric charge through a conductor

• Electrical Current

• Static Electricity

• Magnetism

• Conductors

An object through which electrons and heat can easily flow is called a(n) ​ (a)   ​ ; these tend to be ​ (b)   .

• conductor

• metals

• nonmetals

• insulator

• semiconductor

• metalloids

Static electricity is the build up of ______ particles.

(a)  

• Charged

• uncharged

What is an Electromagnet?

• – is a machine that produces an electric current when a coil of wire wrapped around an iron core is rotated near a magnet.

• a coil of wire spinning around a magnet or

• is formed when a wire in an electric circuit is wrapped around an iron core producing a magnetic field.

• a magnet spinning around a coil of wire .