WorksheetsMotors and Generators
Total questions: 32
Worksheet time: 25mins
Name
Class
Date
1.
How do you increase the strength of an electromagnet?
a)
Decrease the number of batteries and increase the number of coils
b)
Increase the electric current and decrease the batteries
c)
You cannot strengthen an electromagnet
d)
Increase the electric current and increase the number of coils
2.
How are electromagnets different from regular magnets?
a)
Their strength can be changed
b)
They can be turned on and off
c)
Their polarity can be reversed
d)
All choices are correct
3.
Which of the following is NOT an example of a kind of magnet?
a)
ferromagnet
b)
electromagnet
c)
permanent magnet
d)
giant magnet
4.
A coil of wire that has a soft iron core and that acts as a magnet when an electric current is in the coil is call a(n)
a)
Ferromagnet
b)
Electromagnet
c)
Permanent magnet
d)
Temporary magnet
5.
What is created when a magnet moves through a coil of wire?
a)
An electric current
b)
An electromagnet
c)
A solenoid
d)
A ferromagnet
6.
Whether a material is magnetic or not depends on which of the following?
a)
The material's weight
b)
The material's mass
c)
The type of material
d)
The material's density
7.
A propogating wave in space (light, microwave, gamma, etc)
a)
Electromagnetic wave
b)
mechanical wave
c)
transverse wave
d)
Marvin the Martian wave
8.
A machine that converts electrical energy into mechanical energy.
a)
Generator
b)
Motor
c)
Parallel circuit
d)
Ohm
9.
What makes an electromagnet stronger?
a)
Increase the number of wire wraps around the iron core
b)
decrease the strength of the power source
c)
remove the source of current
d)
lightning bolts hitting a tree
10.
What is the relationship between electrical current and magnetic field strength in an electromagnet?
a)
When current is increased, magnetic field strength increases
b)
When current is increased the strength of magnetic field decreases
c)
When the current is decreased, the strenght of the magnetic field is increased.
d)
There is an "indirect proportion," meaning, if the value of one goes up, the value of the other goes down.
11.
This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
a)
Add more coils of wire to the nail.
b)
Use a smaller battery.
c)
Reverse the poles of the magnet.
d)
Remove all the coils and the nail.
12.
Which of the following is NOT part of an electromagnet?
a)
Wire
b)
Iron
c)
Toothpick
d)
Power source
13.
How are electromagnets different from magnets?
a)
magnets can be turned on/off
b)
you can turn an electromagnet on/off
c)
magnets are more powerful
d)
magnets have a North and South pole
14.
When an electric current flows throught a wire, the current produces a __________ __________.
a)
magnetic field
b)
force field
c)
electromagnet
d)
electromagnetic pulse
15.
In order to make an electromagnet, you need a
a)
battery, nail, and magnet
b)
battery, wire, and nail
c)
magnet, nail, and wire
d)
all of the above
16.
What does a motor do?
a)
Moves up and down
b)
Rotates without Electricity
c)
It does
d)
Uses Electricity to cause motion (usually, rotational motion)
17.
As water flows through a dam, a generator is turned and creates enough electricity for thousands of homes. This describes...
a)
biofuels
b)
hydroelectric energy
c)
geothermal energy
d)
solar energy
18.
This picture shows a turbine generator used to produce electricity at a geothermal power plant.
Electricity is produced by using steam to _____________.
Electricity is produced by using steam to _____________.
a)
heat the turbine generators
b)
spin the turbine generators
c)
reduce friction in the turbine generators
d)
reduce emissions from the turbine generators
19.
What is the job of the generator in a coal power plant?
a)
Use electrical energy to turn a turbine.
b)
Convert electrical energy into mechanical energy
c)
Turn the turbine which changes water into steam
d)
To change mechanical energy into electrical energy
20.
Ms. J's students are complaining that it is hot in the classroom. She plugs in the fan and turns it on... Which energy transformation occurs?
a)
mechanical to electrical
b)
electrical to mechanical
c)
chemical to mechanical
d)
electromagnetic to mechanical
21.
This transforms mechanical energy into electrical energy.
a)
Generator
b)
Electromagnet
c)
Motor
d)
Circuit
22.
What is the transfer of electricity in a motor?
a)
chemical to mechanical
b)
electrical to mechanical
c)
mechanical to electrical
d)
physical to potential
23.
In order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.
a)
wire, iron, electric
b)
electric, wire, iron
c)
iron, electric, wire
d)
excited, hair, apple
24.
What is the device seen here?
a)
generator
b)
electric motor
c)
electromagnet
d)
magnet
25.
What happens to the strength of an electromagnet as you add more coils around it?
a)
Increases
b)
Decreases
c)
Stays the same
d)
Stops completely
26.
What type of energy comes OUT of a generator?
a)
Mechanical
b)
Electrical
c)
Thermal
d)
Potential
27.
What energy do you put IN to a generator?
a)
Mechanical
b)
Electrical
c)
Thermal
d)
Potential
28.
What two forces are required for generators and electric motors to work?
a)
magnetism and thermal
b)
electricity and thermal
c)
electricity and magnetism
d)
magnetism and radiant
29.
Which device uses mechanical energy to produce electrical energy?
a)
Electric Motor
b)
Magnet
c)
Generator
d)
Solar Cell
30.
In large generators in power plants, ___________ rotate inside a coil of wire to produce an electric current.
a)
wind
b)
water
c)
magnets
d)
circuits
31.
In a motor, a ___________ provides the necessary push to make current flow.
a)
crane arm
b)
copper wire
c)
battery
d)
piece of iron
32.
When a wire loop is connected to a battery, ______________ is produced in the loop.
a)
a "Dark Side" force field
b)
an electric field
c)
a magnetic field
d)
a baseball field
100 %
