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- 1. Multiple Choice
What type of magnet that can turned on and off?
electromagnet
permanent magnet
electricity
battery
- 2. Multiple Choice
Why does a compass needle move when electricity flows through a coiled wire?
Because a magnetic field is not produced, which does not attract the needle.
Because a magnetic field is produced in the coiled wire, which attracts the compass needle.
Because the battery produced a electric field.
Because the compass is pointing north
- 3. Multiple Choice
What would happen if you took one end of the wire off the battery?
The nail will be a magnet.
The nail would no longer be a magnet
Nothing will happen
The nail will heats up.
- 4. Multiple Choice
Which part of the electromagnets turned into a magnet when electricity flows through a coiled wire?
Battery
Copper wire
Iron Nail
Bulb
- 5. Multiple Choice
Bob made an electromagnet but it was very weak. How can he make it stronger?
take away the battery
wrap the wire more loosely
add additional coils
use less coils
- 6. Multiple Choice
In an electric motor, the coil of the rotor turns into an electromagnet when ...
the rotor rotates inside the stator
electric current flows through the coil
the rotor is turned by the axle
the commutator is switched on
- 7. Multiple Choice
The commutator is
The spring-loaded connections that keep contact with the stator
the device that causes the current to change direction
the magnets that cause the electromagnet to attract and repulse
the coil that is also known as the armature
- 8. Multiple Choice
The greater the number of windings (the number of times it is wrapped around) in an electromagnet's coil
the stronger the magnet is
the less the magnet will pick up
the more current it takes to create the electromagnet
the slower the compass needle moves to the wire
- 9. Multiple Choice
Which of the following will produce the strongest electromagnet?
A coil of 20 turns of wire
A coil of 20 turns of wire
A coil of 30 turns of wire
A coil of 40 turns of wire
- 10. Multiple Choice
In an electric motor, the energy transformation changes from __________ energy & becomes ___________ energy.
electrical and becomes chemical
mechanical and becomes electrical
electrical and becomes mechanical
mechanical and becomes chemical
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