HSC Physics – Motors and Generators – Summary Notes

Motors and magnetic deplumates?Motor effect & F = BILoA certain carrying theater director in a magnetic field experiences a force.

oF = nBIL sin ?F = force on conductor (N)n = routine of whirlsB = magnetic field strength (T)I = current in conductor (A)? = angle amongst conductor and magnetic field.

?Conductor serious angle to field = strong. Parallel = no force.

?Force between current carrying wiresoAmpere?s Law: F = k I1 I2 ldF = force between two wires (N)k = ampere?s constant = 2.0 X 10-7 (NA-2)I1 , I2 = current in wires (A)l = length of parallel wires (m)d = distance between wires (m)oCurrent in same direction = attractive force.

oCurrent in opposition direction = repulsive force.

?Torque on a loopoTorque = crook effect of a force.

oT = Fd = force x distance from pin tumbler point.

oT = nBIA cosine ?T = torque ? = angle between categoric of loop and mag fieldn = no. of hand-buildsB = magnetic field strength (T)I = current through coil (A)A = area of coil (m2)?DC Electric Motor:?Loudspeaker: Current flows through coil attached to cardboard coil. Current varies with desired sound. axial intercommunicate in permanent magnetic field, coil moves due to motor effect, coil moves cardboard, produces sound.

?Galvanometer:Current flows through coil attached to spring and needle. Coil surrounded by magnetic field, moves.



Depending on size of current, moves trough spring stops counteracts the motor affect. Needle points to size of current.

The generator?Faraday?s discovery of induction.

oMoved a magnet near a coil of wire.

oCurrent produced only when the magnet was in relative motion to the coil.

?Magnetic conflate & flux densityoMagnetic flux = mensuration of magnetic field passing through an areao? = BA cos ?? = phi = magnetic fluxB = magnetic field strength (T) = magnetic flux densityA = area...

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