WorksheetsElectromagnetism
Total questions: 35
Worksheet time: 40mins
What happens in an electromagnet?
Mechanical energy produces an electric field
Mechanical energy transforms into electrical energy
Electrical energy produces a magnetic field
Electrical energy transforms into mechanical energy
Magnetism is caused by ________________.
protons in the nucleus
the motion of electric charges
light waves striking certain rocks
magic
Moving a magnet next to a wire causes ____________.
the wire to catch fire
nonmetals to be repelled
a gravity wave
an electric current
A current moving through a wire causes _____________.
a magnetic field
alternating currents
direct currents
protons to move through the wire
Electric motors convert _________ energy into _________ energy.
kinetic / electric
electric / kinetic
heat / kinetic
heat / electric
Electric generators convert _________ energy into _________ energy.
kinetic / electric
electric / kinetic
kinetic / heat
electric / heat
A device that protects a circuit by from having too much current is called a
switch
short
fuse or breaker
resistor
You can increase the strength of an electromagnet are increasing the current, adding iron to the core, and .....
increasing the number of coils on the magnet
Decreasing the number of coils on the magnet
Dividing the number of coil
All permanent magnets have two
magnetic charges
magnetic fields
magnetic needles
magnetic poles
The magnetic field lines around a bar magnet
are perfectly straight
are only perpendicular to the magnet
spread out from one pole and curve around to the other
cross back and forth over one another
Which way will NOT increase the strength of the magnetic field of an electromagent
increasing the current
using a stronger ferromagnetic core
winding the coils closer together
decreasing the number of loops
What type of materials are needed to create an electromagnet?
battery, light bulb, plastic straw
battery, coil of wire, iron core
generator, iron core, switch
switch, source of electricity, compass
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
What uses electricity to move parts?
speaker
motor
generator
doorbell
What energy conversions take place in a kitchen toaster?
heat to mechanical
electrical to heat
heat to chemical
electrical to chemical
Which of these is designed to produce heat from electricity?
a camera
a television
a blender
a toaster
The strongest part of a magnet is...
What causes magnetism?
the sun
moving neutrons
moving charges
friction
In what direction is the electric current flowing according to right hand rule 2?
Up
Down
Left
Right
Devices which is used to convert high alternating current to low alternating current is …………………
Step up transformer
Step down transformer
A device for producing electric current is ……………………
Motor
Generator
Transformer
The Earth produces its own ________ field.
spectrum
electric
magnetic
progressive
A permanent magnet is a material that produces a ___________________ field without any ___________________ magnetic field being present.
electronic, internal
magnetic, internal
magnetic, external
electronic, external
Certain materials respond to magnetic fields by becoming ______________ themselves. ____________ is one of these materials.
magnetic, Plastic
electronic, Iron
magnetic, Iron
electronic, Plastic
Using the right hand rule, B represents the direction of the
current
magnetic field
Using the right hand curl rule, A represents the direction of the
current
magnetic field
The diagram show the direction of magnetic field,B and current, I.
By using Fleming left hand rules, determine the direction of Magnetic force, F.
left
downward
into the page
out from the page
A current carrying wire is placed between two magnets as shown in the diagram.What is the direction of force acting on the wire?
into the paper
out of the paper
right
left
