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Electromagnet Study Guide
Test Description: Study guide for middle school science- electromagnet related.
Instructions: Answer all questions to get your test result.
1) What is an electromagnet?
A
A magnet attached to an electrical appliance.
B
A magnet that sticks to a light switch.
C
A magnet attached to an electrical wire.
D
A current-carrying wire wrapped around an iron core.
2) What supplies to you need to make an electromagnet?
A
Electrical tape
B
A battery.
C
Copper wire.
D
All of the above.
3) What is kinetic energy?
A
The energy that an object will have if put in motion.
B
The energy that an object in motion has.
C
The amount of heat an object creates.
D
The amount of light an object produces.
4) What is a motor?
A
Any devise that converts thermal energy to potential energy.
B
Any devise that converts solar energy to thermal energy.
C
Any devise that converts electric energy to kinetic energy.
D
Any devise that converts potential energy to kinetic energy.
5) What protects the Earth from most of the Sun's charged particles?
A
The magnetosphere.
B
The atmosphere.
C
The ozone layer.
D
The stratosphere.
6) What does a generator do?
A
Uses coal to create energy.
B
Uses a magnetic field to turn motion into electricity.
C
Uses solar pwer to create hot water.
D
Uses electritcity to make light.
7) What type of current changes from positive to negative 60 times each second?
A
Alternating current
B
Direct current.
C
Alternative current.
D
Different current
8) What produces most of the electric energy used all over the world?
A
Electric generators
B
Solar power
C
Nuclear power
D
Fire wood
9) What does a transformer do?
A
Changes the voltage of a device with a lot of energy lost.
B
Chages the voltage of a device with little loss of energy.
C
Changes the strength of the magnetic field.
D
Changes the type of energy being produced.
10) Why does a superconductor allow electricity to pass through it without heat being produced?
A
The electrons in the electrical current do not collide with the atoms in the superconductor.
B
Electricity does not produce heat,
C
The electrons in the electric current are no longer charged as they pass through the superconductor.
D
The superconductor resists the flow of electricity.
*select an answer for all questions
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