Magnetism and Electric Current

⚫ A solenoid is a coil
of wire with an
electric current in
it.

⚫

The electric
current creates a
magnetic field
around each loop of
the wire.

◼

more loops = more
magnetic force

◼

more current =
more magnetic
force

Magnetism and Electric Current

⚫
The magnetic
force of a solenoid
can also be
strengthened by
adding a soft iron
core to its center.

⚫

This is called an
electromagnet.

Creating Electric Current

⚫
Faraday’s Lawof
Induction describes
the production of a
current in a
conducting circuit by
a change in the
strength, position, or
orientation of an
external magnet.

Creating Electric Current

⚫
Electrical generators change mechanical
energy to electrical energy using
electromagnetic induction.

In a commercial generator, an electric current is
produced when a large coil of wire is rotated
through a strong magnetic field.

Using Electric Current

⚫
Electric Motors
convert electrical
energy into
mechanical energy by
using magnets to
create motion.

⚫

Inside an electric
motor, the
attracting and
repelling forces of
two magnets create
a rotational motion.

• A generator is a device that converts mechanical energy into electrical energy.

• Most of the electrical energy we use comes from generators

​​Generators

• Electric motors convert electrical energy into mechanical energy that is used to do work. Examples of motors include those in many household appliances, such as blenders and washing machines

Motors