Magnetic Induction

A coil has an inductance of____ Henry when a current change of___ampere per second results in an Induced voltage of___ volts.

1,1,1

Three factors determine the amount of voltage that will induced in a conductor.

1. the number of turns of wire 2.the strength of the magnetic field(flux density) 3.the speed of the cutting action.

In order to induce 1 volt in a conductor,the conductor must cut_____ lines of flux.

100,000,000 or 1 weber(Wb)

If the speed of rotation is____,the conductor cuts more lines of flux per second,and the amount of induced voltage increases.

Increased

______ always oppose a change of current.

Inductors

Henry(H) Joseph Henry

The unit of measurement for inductance(L)

air~core conductor

a coil wounded on a non magnetic core such as wood or plastic.

The_____ of current determines the strength of the magnetic field.

amount

iron core~inductor

coil is wounded on a core made of magnetic materials such as silicon steel or soft iron

The important factor concerning electromagnetic Inductions are a _______,________ and _______.

conductor,magnetic field,relative motion.

If speed of rotation remains the___ and the _____ of the magnetic field is increased,there will be more lines of flux per square inch.

constant,strength

When a voltage is induced in a coil and there is a complete circuit,______ flows through the coil.

current

exponential curve

describes the rate of certain occurrences. The curve is divided into 5 times constant.

The______of the current flows determines the polarity of the magnetic field.

direction

_________ can be used to determine the relationship of the motion of the conductor in a magnetic field to the direction of the induced current.

left hand generator rule

One of the basic laws of electricity is that whenever current flows through a conductor,a_____ field is created around the conductor.

magnetic

when current flows through the coil,a____ field is created around the coil.

magnetic

When a resistive load is suddenly connected to a source of DC, the current instantly rises to it______value.

maximum

voltage spike

may occur when the current flows through an inductor stops

If more turns of wire are added to the loop_____ flux lines are cut per second and the amount of induced voltage increases again.

more

when there is_____lines of flux,the number of lines cut per second____ and the induced voltage increases.

more,increases

The amount of inductance a coil has determined by its ____ properties and construction.

physical

Lenz's Law

states that an Induced voltage or current opposes the motion that causes it.

electro magnetic induction

whenever a conductor cuts through magnetic lines of flux,a voltage is induced into the conductor.