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M&G

References

UNSW

HSC online

AC Motors

Transformers

Power

Insulation

Generators

Lenz's Law

Motors

Motor Effect

Current creates a force

Applications

loudspeaker

Radial Field (Push up down)

Spring

Galvanometer

Axial Field (B is not a function of angle)

Force prop Current

Spring means deflection = current

DC Motor

Through Field

Comutator to change current

External Magnet

Electromagnet

Perminant

Commutator

Loop

Coil

t = BAincos(q)

n = turns

B = Field in tesla T

A = area x m times y m

i = current A

q= angle to mag field

One wire

t = Fd

Torque has units Newton meters

Vectors do not have to known

1nm clockwise

Wire

Two wires

F Force N newtons attractive

l Length m meters length of parallel wire

k 2E-7 magnetic constant

d separation m meters

I current A amps

The force of 1 N is read off the apparatus, defining the amp and thus also the coulomb

F/l = KII/D

Parallel Pull together

Anti Parallel = anti

Single wire

F = BIlSin(q)

- Field Strength (tesla T)

- I Current (amps A)

- l Length (m)

- Sin(q) angle

Magfields

Worked solutions

Drawing

in x Out .

Solenoid Loop

N -> S

Handrules

Solenoid finger flow in current , thumb points north

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Finger field, thumb up current, palm push

Grip wire