WorksheetsElectromagnets/Motors
Total questions: 27
Worksheet time: 23mins
Which statement is true?
I. All electromagnets are permanent magnets.
II. Increasing the number of coils in an electromagnet decreases it strength.
III. Increasing the batteries increases the strength of an electromagnet.
Both I and II
Which can increase the strength of an electromagnet?
increasing the number of coils around the nail
increasing the number of batteries
making the core bigger
all of the above
Which of the following is NOT part of an electromagnet?
wire
core
battery
needles
What type of device is shown?
Electromagnet
Electric motor
Electric generator
Electromagnetic induction
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
Which of the following describes a motor?
It creates mechanical energy.
It doesn't need an electrical source to function.
It doesn't follow the Law of Conservation of Energy.
It converts electrical energy into mechanical energy.
Electromagnet is a permanent magnet
True
False
The area surrounding a magnet that applies a force without touching the object.
magnetism
magnet
magnetic theory
magnetic field
A magnet is a piece of metal that attracts (choose more than one)
iron
plastic
glass
steel
What do the lines around this magnet represent?
¿Qué representan las líneas alrededor de este imán?
North Pole
South Pole
Magnetic Declination
Magnetic Field
The diagram shows the magnetic field surrounding a bar magnet. The closer together the lines of force, the stronger the magnetic field. According to the diagram, where is the magnetic field the strongest.
north pole
south pole
both poles
in the middle
Which pair of magnets would result from cutting the magnet in half?
The picture shows an experiment used to determine the effect of using more nails in the core of an electromagnet. Which of the following would make this a better-designed experiment?
Using a different number of batteries for each electromagnet
Using the same number of turns of wire for each electromagnet
Inserting an ammeter in each circuit between the battery and the nails
Using a different size battery for each electromagnet
Scientists believe that magnetism is caused by the spin of certain atomic particles called....
electrons
protons
neutrons
magnetrons
Mr. Robinson and his class are conducting an experiment. The class needs to choose a good insulator. Which of the following could be used as an insulator?
plastic plate
silver spoon
copper wire
gold necklace
What is the current produced by a 9-volt battery flowing through a resistance of 0.2 ohms?
1.8 amps
45 amps
0.022 amps
8.8 amps
Which two areas of physical science are closely related to the development of electric motors and generators?
sound and light
electricity and sound
light and magnetism
electricity and magnetism
Silver has a resistance of 0.0198 ohms. What voltage would produce a current of 100 amps?
1.98 V
0.000198 V
5050 V
100.0198 V
The function of a generator is to change ______
chemical energy to electrical energy
electrical energy to chemical energy
mechanical energy to electrical energy
electrical energy to mechanical energy
This exerts a force that causes other electric charges to move.
electrical poles
electrical fields
insulators
conductors
This is an example of what type of circuit?
simple
series
parallel
Why does a compass align itself with Earth's North Pole?
Because compass needles are slightly magnetized and align themselves with earth's magnetic field
Because one of the poles of the magnet is called the North Pole, so it would only make sense that it would be on the North side
They don't actually do this, they just align themselves with the North side of a map
Because North is slightly downhill (as long as you are in the Northern Hemisphere) so gravity causes the compass to point North
