Motors and Generators

How do you increase the strength of an electromagnet?

• Decrease the number of batteries and increase the number of coils
• Increase the electric current and decrease the batteries
• You cannot strengthen an electromagnet
• Increase the electric current and increase the number of coils

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NGSS.MS-PS2-3

How are electromagnets different from regular magnets?

• Their strength can be changed
• They can be turned on and off
• Their polarity can be reversed
• All choices are correct

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NGSS.MS-PS2-3

Which of the following is NOT an example of a kind of magnet?

• ferromagnet
• electromagnet
• permanent magnet
• giant magnet

A coil of wire that has a soft iron core and that acts as a magnet when an electric current is in the coil is call a(n)

• Ferromagnet
• Electromagnet
• Permanent magnet
• Temporary magnet

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

What is created when a magnet moves through a coil of wire?

• An electric current
• An electromagnet
• A solenoid
• A ferromagnet

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NGSS.HS-PS2-5

Whether a material is magnetic or not depends on which of the following?

• The material's weight
• The material's mass
• The type of material
• The material's density

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NGSS.MS-PS2-3

A propogating wave in space (light, microwave, gamma, etc)

• Electromagnetic wave
• mechanical wave
• transverse wave
• Marvin the Martian wave

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A machine that converts electrical energy into mechanical energy.

• Generator
• Motor
• Parallel circuit
• Ohm

What makes an electromagnet stronger?

• Increase the number of wire wraps around the iron core
• decrease the strength of the power source
• remove the source of current
• lightning bolts hitting a tree

Tags

NGSS.MS-PS2-3

What is the relationship between electrical current and magnetic field strength in an electromagnet?

• When current is increased, magnetic field strength increases
• When current is increased the strength of magnetic field decreases
• When the current is decreased, the strenght of the magnetic field is increased.
• There is an "indirect proportion," meaning, if the value of one goes up, the value of the other goes down.

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NGSS.MS-PS2-3