Electrical Motors

Which statement best explains the flow of energy through a motor?

• battery-->electrical current-->copper wire rotor -->magnet--> mechanical energy

• battery--> magnet--> electrical current--> copper wire rotor--> mechanical energy

• magnet--> mechanical energy--> copper wire rotor--> battery--> electrical current

• magnet--> copper wire rotor--> mechanical energy--> battery--> electrical current

Tags

NGSS.MS-PS3-5

Surrounding every magnet is a __________  __________.

• magnetic field

• electrical current

• another magnet

• an enemy

What two forces are required for generators and electric motors to work? 

• magnetism and thermal 

• electricity and thermal 

• electricity and magnetism 

• magnetism and radiant 

Tags

NGSS.MS-PS2-3

Which best describes how a motor works?

• When a fan blows on a wire, it causes it to spin, creating a force.

• When a fan blows on a wire, it causes it to spin, creating an electrical current.

• When a wire that carries electrical current is placed in zero gravity, the wire experiences a force.

• When a wire that carries electrical current is placed in a magnetic field, the wire experiences a force.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What is the primary function of an electric motor?

• To convert electrical energy into mechanical energy

• To convert mechanical energy into electrical energy

• To store electrical energy

• To generate alternating current

Which statement best summarizes how simple motors work?

• When a fan blows on a wire, it causes it to spin, creating a force.

• When a fan blows on a wire, it causes it to spin, creating an electrical current.

•  When a wire that carries electrical current is placed in zero gravity, the wire experiences a force.

• When a wire that carries electrical current is placed in a magnetic field, the wire experiences a force.

A student made an electric motor model, as shown in the image, and investigated the role of varying magnetic field strength on the coil rotating in an electric motor. 
 

The student started using magnets of different sizes and observed that bigger magnets made the coil move faster. Choose a word or phrase for each blank to correctly complete the sentence explaining the observation in the investigation.

Larger magnets generate ​ (a)    magnetic fields than smaller magnets, and this magnetic field exerts a greater force on the coil, causing it to ​ (b)   .

• stronger

• rotate faster

• weaker

• rotate slower

• stop rotating

Tags

NGSS.MS-PS2-3

Electric motors are devices that convert _____ energy into  _____ energy.

• electrical; mechanical

• mechanical; electrical

• chemical; potential

• mechanical; kinetic

Label the parts of an electric motor.

a

b

c

d

Permanent Magnet

Armature

Brushes

Commutator

In an electric motor, the energy transformation begins as  ----

• electrical and becomes chemical

• mechanical and becomes electrical

• electrical and becomes mechanical

• mechanical and becomes chemical

Tags

NGSS.HS-PS3-3

NGSS.HS-PS3-5