Transcript Force + Pressure + Magnetism + Reflection

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Effects of
Electric current
By
Nitin Oke
For Safe Hands Akola
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Effects of electric current
• Electric current can
produce magnetism,
which can be verified
by deflection of
magnetic needle
placed in “coil” of wire.
• This phenomenon was
observed by Hans
Chritian Orsted.
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Facts
• The magnetic property is seen only if current
is flowing.
• The magnetic property is more if current is
more.
• Magnetic property reduces as the needle is
moved away from wire
• The direction of deflection is reversed if the
direction of current is reversed.
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Induced electricity
• Michel Faraday thought that if
current can produce magnet
then why not magnet will
produce current?
• The current is produced due to
motion of magnet ( not just
presence of magnet) such
current is called as “induced
current” and event as “electro
magnetic induction”.
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Properties of induced current
• The induced current exist till
magnet is moving
• The direction of induced
current depends on direction
of moment of magnet.
• If the magnet approaches the
coil faster then more current is
induced and if the approach is
slow then less current is
induced.
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Electric motor
• The magnet due to current was used
to produce mechanical energy using
electrical energy in electric motor.
• The phenomenon was simple as if we
place a coil in horse shoe magnet and
allow current to pass it will rotate due
to creation of opposite poles. A
“commutator” changes the pole
positions of electromagnet due to
change in direction of current. So coil
keeps on rotating instead of just half
rotation.
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Electric bell
• An application of electromagnet is electric
bell. It uses simple circuit as shown in figure.
Due to completion of circuit the
electromagnet attracts the striker, the striker
when moves towards the electromagnet it
breaks the circuit and hence recoils back due
to which circuit is completed and process
repeats.
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Working
of
electric
bell
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Classification of elements
• All elements can be classified as
– “Conductors” which conducts electricity
– Nonconductors or “insulators” which do not
conduct electricity
– Some elements are also called as
“semiconductors” which can conduct if
temperature is more but don’t at low
temperatures
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Representation of components
• While representing
electrical circuit following
symbols are used.
– Cell
– Battery
– Key
– Source of Alternating
current
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Symbols used in electric circuits
• Cell
• Battery
• Key
• Source of
Alternating
current
For Safe Hands
By Nitin Oke
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