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WorksheetsU3.21 Checkpoint #4
Total questions: 82
Worksheet time: 1hrs 13mins
You can increase the strength of an electromagnet by...
changing the position of the compass
adjusting the magnetic declination
using a stronger ferromagnetic material for the core
reversing the magnetic domains
You can increase the strength of an electromagnet by
adding loops of wire
decreasing the current in the solenoid
winding the coils more loosely
using direct current
The north and south poles of a solenoid change with
the type of material in the core
the number of loops in the coil
the tightness of loops in the coil
the direction of the current
Both solenoids and electromagnets produce magnetic fields using
electric current and coiled wires
compasses and magnetic fields
coiled wires and a ferromagnetic core
electric current and a battery
(a) discovered that wherever there is electricity, there is magnetism.
An electric (a) produces a magnetic field.
One way to increase the strength of a magnetic field in an electromagnet is to increase the amount of current in the wire. (a)
One way to increase the strength of a magnetic field in an electromagnet is to increase the number of coils in the wire. (a)
One way to decrease the strength of a magnetic field in an electromagnet is to increase the number of coils in the wire. (a)
One way to decrease the strength of a magnetic field in a solenoid is to change the core. (a)
One way to increase the strength of a magnetic field of an electromagnet is to wind the coils more closely together. (a)
One way to change the magnetic field strength of an electromagnet is to change the core. (a)
The four C's to change magnetic field strength in an electromagnet are: Coils, Current, Closeness, and Core. (a)
You can increase the strength of an electromagnet's field by (choose all that are correct)
decreasing the current in the solenoid
decreasing the number of loops in the solenoid
using a stronger ferromagnetic core
winding the coils more loosely
increasing the number of loops in the solenoid
You can increase the strength in an electromagnet's field by (choose all that apply).
increasing the current in the solenoid
winding the coils more tightly
increasing the number of loops in the solenoid
winding the coils more loosely
decreasing the number of loops in the solenoid
An electric wire produces a
magnetic field
magnet
solenoid
insulator
A(n) (a) is a strong magnet that can be turned on and off.
Increasing the number of loops in a solenoid will cause the strength of its magnetic field to (a)
Rearrange in order of increasing magnetic strength.
A
C
B
Use the graph to predict the strength of a 12 loop solenoid.
300 gauss
600 gauss
700 gauss
1200 gauss
What happens to the magnetic field of a solenoid if the current is increased?
The magnetic field decreases
The magnetic field remains the same
The magnetic field increases
The magnetic field reverses direction
Which of the following materials is commonly used as the core of an electromagnet?
Plastic
Wood
Iron
Glass
What is the primary function of a solenoid in an electric circuit?
To store electrical energy
To produce a magnetic field
To resist the flow of current
To convert electrical energy into light
What is the unit of electric current?
Volt
Ampere
Ohm
How could you investigate the strength of an electromagnet?
See how many plastic beads it can hold
See how many steel paper clips it can hold
See how many copper nails it can hold
See how many brass tacks it can hold
What happens when an electric current flows through a wire?
The wire begins to spin.
Nothing happens.
A field of gravity is created around the wire.
A magnetic field is created around the wire.
What does this image show?
Parallel circuit
Series circuit
Magnet
Electromagnet
The area of magnetic force around a magnet is known as its ____________.
magnetism
magnetic current
magnetic field
electric current
How do you increase the strength of an electromagnet?
Add a motor and/or light bulbs
Add more light bulbs and wire coils
Add more wire coils
Increase the voltage
What is/are the difference(s) between a magnet and an electromagnet?
An electromagnet can be turned on/off.
A magnet can be turned off.
An electromagnet is stronger.
A _______________ is a current-carrying coil of wire with many loops.
magnet
electromagnet
solenoid
compass
Increasing the number of coils in an electromagnet will _________ the power of the magnet.
decrease
increase
not affect
This device converts mechanical energy into electrical energy. It creates electricity.
Electric Generator
Electric Motor
Electromagnet
Voltmeter
A material that allows the free flow of electric charges.
Conductor
Insulator
Semiconductor
What was the Tesla-Edison feud all over?
AZDZ
AC vs DC
Rock Metal
Two old smarty pants fighting just to fight
If a charged particle is moving, it has (a)
What type of device can increase and decrease voltage?
Generators
Transformers
Galvanometers
Electric motors
What type of device converts mechanical energy into electrical energy?
solenoid
electric motor
transformer
generator
A plant generating electric current
transmits alternating current at high voltages, but is used at low voltages
transmits direct current at high voltages, but is used at low voltages
transmits alternating current at low voltages, but used at high voltages
transmits direct current at low voltages, but used at high voltages
What do electric generators do
transform mechanical energy to electrical energy
transform mechanical energy to sound
transform electrical energy to mechanical energy
transform electrical energy to potential energy
What type of equipment is used to measure the current induced when a wire passes through a magnetic field?
a transformer
a galvanometer
a generator
an insulated wire
What type of current is produced in a battery
induced
magnetic
alternating
direct
Moving a permanent magnet through a coil of wire will
demagnetize the magnet
the wire will become an electromagnet
the magnet will become electrified
a current will be generated in the wire
Look at the circular arrow in the diagram. The side of the loop closest to the (a) magnetic pole is moving up.
When a wire moves up or down repeatedly in a magnetic field a(n) (a) current is induced in the wire.
A step-up transformer is a transformer that (a) voltage.
A step-down transformer is a transformer that (a) voltage.
Electric current from a generating plant is
(a)
The type of current produced by a battery is
(a)
As the crank of a generator is turned, the (a) rotates in the magnetic field.
In a generator, the up-and-down motion of the (a) induces current in the wire.
The voltage in the (a) coil of a transformer induces a current in the (b) coil.
An electric current is produced in a conductor when the conductor moves through a (a)
A current that constantly reverses is called (a) current.
A(n) (a) voltage can be easily raised or lowered.
A DC motor is like an AC generator, except that the motor transforms (a) energy into (b) energy, while the generator transforms (c) energy into (d) energy.
You can increase a step-up transformer's voltage with
a power source connected to the primary coil
a power source connected to the secondary coil
increasing the number of loops in the primary coil
increasing the number of loops in the secondary coil
Match the following
Step Up Transformer
Step Down Transformer
Electric Motor
AC generator
The energy an object has due to its movement or position is called
static energy
mechanical energy
potential energy
electrical energy
When a wire with a current is placed in a magnetic field
kinetic energy is transformed into potential energy
electrical energy is transformed into sound & light
electrical energy is transformed into mechanical energy
solar energy is transformed into light & heat
The energy associated with current is called
mechanical energy
magnetism
geothermal energy
electrical energy
An electric motor uses an electric current to turn a(n)
pointer
brush
axle
wheel
A galvanometer uses an electric current to turn a(n)
pointer
brush
axle
wheel
A galvanometer is used to measure small (a)
An electric motor transforms (a) energy into (b) energy.
The armature of an electric motor rotates (a) when the current is turned on.
Permanent magnets produce an electric field that causes the armature of an electric motor to turn. (a)
What is one difference between a galvanometer and an electric motor?
An electric motor causes something to move.
A galvanometer uses an electric current.
In an electric motor, the armature spins continuously.
An electric motor uses electrical energy.
To reverse the direction of current in a motor, current is conducted
through the armature.
in the direction of rotation.
through the brushes to the commutator.
through the commutator to the armature.
According to the diagram, which way will the wire move in the magnetic field?
up
down
left
right
If the current in this picture was reversed, which way would the wire move?
up
down
left
right
Choose 2 ways of causing the loop to rotate in the opposite direction.
reverse the current
turn off the current
reverse the magnetic field
turn off the magnetic field
What common electrical device is shown in this diagram?
electric motor
electric generator
electromagnet
galvanometer
Which piece of equipment would a scientist use to measure the current induced (generated) by moving a wire through a magnetic field?
galvanometer
transformer
insulated wire
LED
Label the parts of an electric motor.
Commutator
Armature
Permanent Magnet
Brushes
Which is not an example of a galvanometer?
analog car gauge
lie detector
electrician's tool
motorized toothbrush
What produces the magnetic field that interacts with the permanent magnets in a galvanometer?
electromagnet
pointer
scale
spring
Two semicircular pieces of metal that conduct current from the brushes.
commutator
armature
permanent magnet
brushes
Produce a magnetic field that causes the armature to turn.
commutator
armature
permanent magnet
brushes
Stationary part that conducts current to the commutator.
commutator
armature
permanent magnet
brushes
Loop of wire that current flows through.
commutator
armature
permanent magnet
brushes
