Motors and Generators

The strength of an electromagnet can be affected by

• changing the current in the wire

• adding more coils

• increasing the mass of the iron core

• All of the above

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Bob made an electromagnet but it was very weak.  How can he make it stronger?

• take away a d-cell
• wrap the wire loosely
• use thicker wire
• use less winds

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NGSS.HS-PS2-5

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A _______________ is a current-carrying coil of wire with many loops

• electromagnet
• solenoid
• magnet
• compass

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This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.
• Use a smaller battery.
• Reverse the poles of the magnet.
• Remove all the coils and the nail.

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NGSS.HS-PS2-5

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In order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.

• wire, iron, electric
• electric, wire, iron
• iron, electric, wire
• excited, hair, apple

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NGSS.HS-PS2-5

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How do electromagnets differ from regular magnets? 

• A. They  can be turned off and on 
• B. Their polarity can be reversed
• C. Their strength can be changed
• D. All of the above

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The flow of electrical energy starts at the  ___ side of the d-cell.

• negative
• positve
• complete circuit
• bulb

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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

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NGSS.HS-PS2-5

How are electromagnets different from magnets?

• magnets can be turned on/off
• you can turn an electromagnet on/off
• magnets are more powerful
• magnets have a North and South pole

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NGSS.HS-PS2-5

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Surrounding every magnet is a __________  __________.

• magnetic field
• force field
• electromagnet
• electromagnetic pulse

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