Motors

What is the main purpose of a motor?

• Convert mechanical energy into electrical energy
• Convert electrical energy into mechanical energy
• Create heat from mechanical motion
• Convert sound into electrical energy

Tags

NGSS.HS-PS3-3

What is the role of an armature in a DC motor?

• To convert mechanical energy into electrical energy
• To transfer current from the brushes to the commutator
• To spin and create rotary motion
• To store electrical energy

Tags

NGSS.HS-PS3-5

Which of the following changes the direction of the current in a DC motor?

• The armature
• The permanent magnets
• The commutator
• The brushes

Tags

NGSS.HS-PS3-5

What happens when like magnetic poles are placed near each other?

• They attract
• They repel
• They combine
• They neutralize each other

Tags

NGSS.MS-PS2-5

What is the function of a brush in a DC motor?

• To provide a magnetic field
• To transfer power from the source to the commutator
• To spin the motor
• To store mechanical energy

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

How does an electromagnet differ from a permanent magnet?

• An electromagnet’s poles can change based on the current direction
• A permanent magnet's poles can change direction
• Electromagnets do not use electricity
• Permanent magnets are more powerful than electromagnets

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What type of energy conversion takes place in a generator?

• Electrical energy to mechanical energy
• Mechanical energy to electrical energy
• Thermal energy to mechanical energy
• Chemical energy to electrical energy

Tags

NGSS.HS-PS3-3

What is the purpose of step-up transformers at power plants?

• To decrease voltage for homes
• To increase voltage for long-distance transmission
• To store electrical energy
• To convert DC to AC power

Tags

NGSS.HS-PS3-3

Which component in a motor reverses the polarity of the electromagnet?

• Armature
• Brush
• Commutator
• DC source

Tags

NGSS.HS-PS3-5

What is the main difference between a motor and a generator?

• A motor generates electricity, while a generator produces heat
• A motor converts mechanical energy to electrical energy, while a generator does the opposite
• A motor converts electrical energy to mechanical energy, while a generator converts mechanical energy to electrical energy
• There is no difference between them

Tags

NGSS.HS-PS3-3