Study Jams Current Electricity

What metal is the best conductor of electrical current?

• Copper

• Silver

• Steel

What are filaments? 

• resistor's in the toaster's circuit

• wires that heat up when they conduct electricity

• both 

Tags

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What type of metal are most wires made of?

• Silver

• Copper

• Steel

Susan is making an electromagnet in her science class today. First, she takes a nail and winds coils of copper wire around it. Then, she connects the ends of the wire to a battery. She uses the electromagnet to pick up paper clips, but the paper clips drop when she disconnects the wires from the battery. Which kind of energy does Susan change into magnetic energy in this project?

• chemical

• electrical

• heat

• light

In a homemade electromagnet, what must you do to increase the number of paper clips their electromagnet picks up?

• make the wire longer

• remove the nail from the center of the wire

• increase the number of loops of wire around the nail

• spread the loops of wire apart on the nail so they do not touch

Donna is attempting to make an electromagnet to pick up old nails in and around her driveway. Which of these materials would be best to use for the core in order to make the strongest electromagnet to pick up the most nails?

• iron nail

• water

• wooden stake

• plastic spoon

Tags

NGSS.MS-ETS1-1

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Which electromagnet would have the most strength?

• An electromagnet with 5 coils.

• An electromagnet with 10 coils.

• An electromagnet with 15 coils.

• An electromagnet with 20 coils.

Tags

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Which change would result in a stronger electromagnet?

• Reducing the number of batteries

• Increasing the voltage of the battery

• Substituting another metal for the iron core

• Decreasing the number of coils around the iron core.

Tags

NGSS.MS-PS2-3

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Braddy connected the loose wire to the battery and created an electromagnet. He picked up 45 thumb tacks with his electromagnet, though his goal was to pick up 50 thumb tacks. What could Braddy do to increase the strength of his electromagnet and pick up more thumbtacks?

• Use fewer coils of wire.

• Use a screw instead of a nail.

• Use two batteries instead of one.

• Replace the nail with a piece of steel.

Tags

NGSS.MS-ETS1-1

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The steady flow of electrons between objects

• battery

• source

• static electricity

• current electricity