Page 49 - Innovator's Science-8

produces electric currents, which create a magnetic field around the
planet. Some animals, like migratory birds and fish, can sense this magnetic

field and use it to find their way during long journeys. The Earth's magnetic
field also protects us by blocking harmful particles that come from space,
helping to keep life on Earth safe.

Now that we know a current– carrying coil behaves like a magnet, let us see
Science how this property is used in daily life.
Bytes

Testimony USES OF ELECTROMAGNETS
Maichael Faraday is
widely considered the Electromagnets have a wide range of uses in our daily life and in industries.
‘Father of To lift heavy objects: An
electromagne sm’ due to Magnet
his founda onal electromagnet is often used
discoveries including the to lift heavy objects. A heavy
principles of object containing iron or
electromagne c
induc on and steel is attracted to the
diamagne sm. His work electromagnet and lifted up Voice
laid the groundwork for Coil
modern when the electric current is
electromagne sm and switched on. The magnetic Suspension
the development of object is transported to Diaphragm
technologies like electric a. To lift heavy object b. Used in speakers
motors and generators. another location and
Uses of electromagnets
released by switching off the
power supply to the electromagnet. The strength of the electromagnet can

be changed according to the weight of the objet by changing the amount of
electric current. Powerful electromagnets are also used to separate
magnetic materials from non-magnetic ones in recycling units.

Use in Speakers: Electromagnets are essential part of devices like radio
speakers, cell phones, headphones, television sets and other devices. In a
speaker, an electromagnet converts electrical signals into sound. When an
electric current passes through the coil, it creates vibrations in a cone

attached to the magnet, and these vibrations produce sound waves that we
can hear.

Use in motors: An electric motor is device used in machines such as fans,
refrigerators, washing machines, water pumps and car parts. An
electromagnet is one of the main parts which converts electrical energy
into kinetic energy to rotate the axle of a motor.

How does an electric doorbell work?

An electric doorbell is an electric device which is based on the principle of
electromagnets.

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Science-8