Electromagnetism: Motors and Generators

Generators are devices that convert _____ energy into _____ energy.

• chemical; mechanical
• mechanical; electrical
• electrical; mechanical
• potential; kinetic

Tags

NGSS.HS-PS3-3

Motors are devices that convert _____ energy into _____ energy.

• chemical; mechanical

• mechanical; electrical

• electrical; mechanical

• potential; kinetic

Tags

NGSS.HS-PS3-3

This object transforms mechanical energy into electrical energy

• Circuit
• Generator
• Motor
• Battery

Tags

NGSS.HS-PS3-3

Which of these pairs of devices operate in reverse of each other?

• generator and motor
• generator and electromagnet
• motor and electromagnet
• electromagnet and resistor

Tags

NGSS.HS-PS2-5

What device turns electrical energy into mechanical energy?

• a solenoid
• a motor
• an electromagnet
• an electric generator

Tags

NGSS.HS-PS3-3

A hand generator is attached to a motor and the hand crank is turned. Which answer best describes the conversions of energy in this process?

• Mechanical Kinetic energy is converted to electrical energy, then the electrical energy is converted to light energy.

• Mechanical Kinetic energy is converted to electrical energy, then the electrical energy is converted to mechanical kinetic energy

• Electric energy is converted to mechanical kinetic energy, then the kinetic energy is converted to potential energy.

• Electric energy is converted to mechanical kinetic energy, then the kinetic energy is converted to electric energy.

Tags

NGSS.HS-PS3-3

A 9V battery is hooked up to a simple DC motor. Which answer choice best describes the energy conversions in this process?

• Electric energy is converted to mechanical kinetic energy.

• Mechanical kinetic energy is converted to electric energy.

• Electric energy is converted to light energy.

• Light energy is converted to mechanical kinetic energy.

Tags

NGSS.HS-PS3-3

A 9V battery is attached to a hand generator. What prediction best explains what will happen and why?

• When voltage is supplied to the hand generator, the DC generator will behave like a motor and the hand crank will turn.

• When voltage is supplied to the hand generator, the electricity from the battery interferes with the electricity from the generator, causing the hand crank to turn.

• Nothing will happen to the hand generator since it is not powering any devices.

• When voltage is supplied to the hand generator, the current from the hand generator and battery will add up and possibly damage the wiring.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

A light bulb is attached to a simple DC motor, and the shaft of the motor is spun rapidly. Which answer best predicts what will happen and why?

• Since the shaft of the motor is being spun by an external source of mechanical energy, it is being used as a generator. This will cause the motor to produce a voltage and light up the light bulb.

• Since the shaft of the motor is being spun by an external source of mechanical energy, it is being used incorrectly and the motor will be damaged in the process. The light bulb will not light up.

• Since there is not a voltage source hooked up to the motor, the motor will not spin and the light bulb will not light up.

• Since the shaft of the motor is being spun by an external source of mechanical energy, the motor casing will begin turning rapidly as well. The light bulb will not turn on, but it will spin rapidly.

Tags

NGSS.HS-PS2-5

Which answer choice is true regarding simple DC motors and DC generators?

• The desired energy input and outputs are different, but they are constructed the same.

• The desired energy input and outputs are different, and they constructed differently.

• The desired energy input and outputs are the same, and they are constructed the same.

• The desired energy input and outputs are the same, but they are constructed differently

Tags

NGSS.HS-PS3-3

NGSS.HS-PS2-5