EO4: EM, Motors, and Generators

A science teacher asked his students to do hands-on experiments in class to investigate ways to increase the lifting capacity of electromagnets. A team of students constructed two models (see diagrams).

Two-Part Question

1) Which one of these models will have a more powerful magnetic field?

2) Which cause and effect explanation best validates your first answer.

• Model Two will have a stronger magnetic field

  Cause: More electricity (12V battery vs 1.5V) and more coils (10 wraps vs 4)

• Model Two will have a stronger magnetic field

  Cause: This model will have a faster rotation which will produce more electricity.

• Model One will have a stronger magnetic field

  Cause: This model has four coils which will produce more electricity.

Tags

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NGSS.MS-ETS1-2

A student built a prototype of a simple electromagnet using a nail, some length of wire, and a battery with the goal of using it to lift three paperclips.When the student first tested this prototype, it could only lift one paperclip.

What design change would increase the magnetic field strength of this electromagnet so that it would lift three paper clips?

• Remove the nail from within the coil.

• Move the battery closer to the nail.

• Increase the number of loops in the coil.

Tags

NGSS.MS-PS2-3

What component becomes a temporary magnet when electricity is flowing through the circuit?

• battery

• wire coil

• switch

• core

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What kind of magnet can be turned on and off?

• refridgerator magnet
• electromagnet
• magnetite
• iron

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What is most likely to happen when the switch is closed?

• A magnetic field should be produced
• The nail will rust
• The battery will explode
• The wire will catch on fire

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What would happen if you took one end of the wire off the battery?

• The nail will be a magnet.

• The nail would no longer be a magnet

• Nothing will happened.

• The nail will heats up.

Tags

NGSS.MS-PS2-3

Generators are devices that convert _____ energy into _____ energy.

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

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In a _______ a spinning turbine moves magnets which generates an electric current.

• Motor

• Generator

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What can you do to make electromagnets stronger?

• Increase number of coils of wire.

• Increase number of batteries used.

• Both A and B.

• Neither A nor B.

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NGSS.MS-PS2-3

What is produced by moving a permanent magnet through a coil of copper wire?

• electricity

• electromagnet

• light

• sound