Download ELECTROMAGNETISM

ELECTROMAGNETISM
The interaction between electricity and magnetism
Definition: Electromagnet

a coil of current-carrying wire that
acts as a magnet that can be turned
on and off.
Definition: Solenoid

a current-carrying coil of wire with
many loops.
SOLENOIDS

When a solenoid is turned on, a
magnetic field is created. If a piece
of iron or other ferromagnetic
material is wrapped by the coils of wire
in a solenoid, a magnet is created when
the current is turned on.
Strength of
ELECTROMAGNETS
The strength of an electromagnet can be increased
by:
1.
Increasing the electric current in the
solenoid
2. Increasing the number of coil loops
around the ferromagnetic material
3. Using a stronger ferromagnetic material
(more iron content)
Using a
stronger
ferromagnetic
material
(more iron
content)
Increasing
the number
of coil
loops
around the
ferromagnetic
material
Increasing the
electric
current in the
solenoid
(more voltage)
Examples of
Electromagnet Uses





A doorbell or an alarm
Moving junk cars
Recording data on your computer
Reading the magnetic strip on the
back of a credit card
Electric motors
Magnetic Forces vs.
Electrical Forces



Electromagnetism - interaction
between electricity and magnetism
a) Magnetic forces arise from the
movement of electrical charge.
b) Electrical forces arise from the
movement of a magnet (induced
current)
*Get a post-it-note
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*Answer the question below:
What
3 factors can
make an electromagnet
stronger?