Lesson Electromagnet

Which component provides the stored energy to run the electromagnet?

• Battery
• core
• coil
• wire

You are making an electromagnet and can choose from a copper, iron or steel rivet for the core.  Which sentence is true?

• You can use all of them because they are all made of metal
• You can use either iron or steel.
• You can only use the iron rivet.
• You can only use the copper rivet.

Samuel Morse, the inventor of the telegraph had a problem.  How can he increase the strength of the electromagnet in his telegraph?

• use thinner wire
• add more batteries
• add a switch
• wind fewer wraps of wire around core

Tim made an electromagnet with one d-cell and wrapped an uninsulated wire 30 times.  It did not work.  How could he fix it?

• wrap the wire more times
• include a switch
• use insulated wire
• use fewer batteries

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS2-3

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

• take away a battery
• wrap the wire loosely
• use thicker wire
• use less winds

Which rule explains why you would not use a brass rivet to make an electromagnet?

• opposites poles attract
• only iron and steel can become magnetized
• electricity flows from positive to negative
• metals conduct electricity

Tags

NGSS.MS-PS2-3

Where does electricity flow in an electromagnet?

• through the insulation
• through the rivet
• through the air
• through the wire

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

• battery
• wire coil
• switch
• core

What component provides the pathway to carry electricity from component to component?

• battery
• wire
• switch
• core

Which component controls the flow of electricity by opening and closing the circuit?

• switch
• battery
• wire coil
• core