Electric Circuits and Electromagnets

A current is produced when _______________ flow in a circuit.

• protons

• neutrons

• electrons

• nucleons

Increasing the number of coils in an electromagnet will _________ the power of the magnet.

• decrease

• increase

• not affect

Dulce is planning an experiment using a nail, wire, and a battery to investigate which factors that affect the strength of an electromagnet, and which factors do not affect its strength. Which factor would least affect the strength of the electromagnet?

• the kind of metal used to make the nail in the electromagnet

• the amount of the current flowing through the electromagnet

• the number of coils of copper wire used in the electromagnet

• the direction of the current flowing through the electromagnet

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Label the parts of the electromagnet.

a

b

c

d

wire

coil

power source

nail

Which of these is a way to make an electromagnet stronger?​ ​ ​ ​ (a)  

• wrapping the wire around the iron core more

• putting a switch in the electrical circuit

• replacing the copper wire with plastic wire

• replacing the iron core with a copper core

Electric current is measured in ____________.

• Newtons (N)

• Amperes (A)

• Hertz (Hz)

What does this image show?

• Parallel circuit

• Series circuit

• Magnet

• Electromagnet

Tags

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How do you increase the strength of an electromagnet?

• Add a motor and/or light bulbs

• Add more light bulbs and wire coils

• Add more wire coils

• Increase the voltage

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What is/are the difference(s) between a magnet and an electromagnet?

• An electromagnet can be turned on/off.

• A magnet can be turned off.

• An electromagnet is stronger.

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

• magnet

• electromagnet

• solenoid

• compass