Motors and Generators CFA 8th Grade Science

A device that takes mechanical energy and converts it to electrical energy is called a:

• Motor

• Generator

• Electromagnet

• Battery

Tags

NGSS.HS-PS3-3

A device that takes electrical energy and converts it to mechanical energy is a:

• Motor

• Generator

• Electromagnet

• Battery

The motor originally made 1000 rotations in 10 seconds. The loops were reduced by half. How many rotations did the wire loop complete in 10 seconds if it made 50 rotations per second after the reduction?

• A. 150

• B. 500

• C. 1000

• D. 3000

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

If a motor is tested with different types of batteries, then the number of spins is counted with each battery, which variable in this investigation is the dependent variable?

• the size of the battery

• the number of loops of copper wire

• the position of the ring magnets

• the speed at which the copper loop spins

Tags

NGSS.MS-PS2-2

Which modification would most likely make the wire loop rotate faster?

• Use a larger battery.

• Use thinner copper wire.

• Use several smaller magnets instead of two large ones.

• Use sandpaper to remove the rubber coating from the loops of wire.

Tags

NGSS.MS-PS2-5

NGSS.MS-ETS1-3

The student spins the nail and the magnets, and the bulb glows. What can the student do to increase the brightness of the bulb?

• Decrease the amount of copper coils.

• Increase the amount of copper coils.

• Increase the size of the box.

• Decrease the size of the magnet.

Tags

NGSS.MS-ETS1-3

A student has two balloons filled with air labeled X and Y. The student rubs balloon X with a silk cloth and attaches it to the bottom of a table. In two trials, the student rubs balloon Y with the silk cloth and attaches it to the bottom of the table at different distances from balloon X. What is the force and is it contact or non-contact?

• Static electricity, and it's a contact force.

• Magnetism and it's a non-contact force.

• Gravity, and it's a non-contact force.

• Static electricity, and it's a non-contact force.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Based on what you know about electromagnetism and how magnetic fields work, which electric motor will turn the coil the SLOWEST?

• Motor with 1.5 volts and 1 coil

• Motor with 1.5 volts and 2 coils

• Motor with 1.5 volts and 3 coils

• Motor with 1.5 volts and 4 coils

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What is the function of the battery in the simple motor diagram?

• To provide electrical energy

• To hold the wire coil

• To increase the speed of rotation

• To decrease the number of loops.

What is the role of the wire coil in the simple motor?

• To provide electrical energy

• To create a magnetic field

• To hold the battery

• To decrease the speed of rotation.

Tags

NGSS.MS-PS3-5