The Left Hand Rule - World of Teaching

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Transcript The Left Hand Rule - World of Teaching

The Left Hand Rule( for motors) shows what happens when charged
particles (such as electrons in a current) enter a magnetic field
This rule is also called Fleming's
Left Hand Rule, after English
electronics pioneer John Ambrose
First finger represents the
direction of the Field.
The Second finger represents the
direction of the Current
[conventional current, positive(+)
to negative(-).
The Thumb represents the
direction of the Thrust or resultant
FBI - moving from thumb to
second finger.
The thumb is the force F
The first finger is the magnetic
field B
The second finger is the of current
The Right Hand Rule simply shows how a current-carrying
wire generates a magnetic field
• point your thumb in the
direction of the current and let
your fingers assume a curved
position, the magnetic field
circling around the wires flows
in the direction in which your
four fingers point.
• Fleming's right hand rule (for
generators). The appropriatelyhanded rule can be recalled by
remembering that the letter "g"
is in "right" and "generator"
Fleming's left hand rule (for electric motors) shows the direction of the
thrust on a conductor carrying a current in a magnetic field
• An electric motor is a motor
that uses electrical energy to
produce mechanical energy,
usually through the interaction
of magnetic fields and currentcarrying conductors.
• Electric motors are used in
most, modern machines.
Obvious uses would be in
rotating machines such as
fans, turbines, drills, the
wheels on electric cars,
locomotives and conveyor
• The reverse process,
producing electrical energy
from mechanical energy, is
accomplished by a generator
or dynamo
• A generator forces electric
charges to move through an
external electrical circuit, but it
does not create electricity or
charge, which is already
present in the wire of its
windings. It is analogous to a
water pump, which creates a
flow of water but does not
create the water inside.
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