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#9 Magnetism, Motors and Generators
By Kristen Derocha
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Last updated almost 5 years ago
12 questions
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Question 1
1.
What is a magnet?
Question 2
2.
What is the relationship between magnets and electricity?
Question 3
3.
Which of the following creates a magnetic field?
Two wires next to each other
A piece of aluminum
A coil of wire carrying current
A plastic insulator
Question 4
4.
What is created when a current is run through a coil of wire wrapped around an iron core? (type one word only)
Question 5
5.
An electric motor spins because:
the voltage pushes the motor around.
an electromagnet attracts and then repels magnets in the rotor.
it is converting mechanical energy to electrical energy.
the electric current is always flowing in the same direction.
Question 6
6.
Electromagnetic induction occurs when:
electromagnets are induced in a wire.
electrons are induced in a magnet by a moving wire.
current is induced in a wire by a moving magnet.
a magnetic field is created in a coil of wire by a current.
Question 7
7.
A current can be induced to flow in a coil in all of the following situations
EXCEPT:
holding a powerful magnet still in the middle of a coil of wire.
sliding a bar magnet into a coil of wire.
moving a coil of wire toward an electromagnet.
sliding a bar magnet out of a coil of wire.
Question 8
8.
Explain the difference between a motor and a generator?
Question 9
9.
How does a step-up transformer work?
A current in a wire causes magnets to spin around a rotor
A spinning rotor induces a current in a wire
Voltage is decreased in a coil of wire by by a coil of wire with more turns
Voltage is increased in a secondary coil with more turns of wire
Question 10
10.
Watch this video: https://www.youtube.com/watch?v=cYkzH90-gj8&t=40s and then explain how a wind turbine generates electricity.
Question 11
11.
According to this article, what are some challenges around windpower?
https://science.howstuffworks.com/environmental/energy/why-cant-we-generate-all-our-energy-from-wind-power.htm
Question 12
12.
Why can't we generate all the electricity we need from the wind?
https://science.howstuffworks.com/environmental/energy/why-cant-we-generate-all-our-energy-from-wind-power.htm