unit 16 Inductance

Four factors concerning inductance?

1) When magnetic lines of flux cut through a coil, a voltage is induced in the coil. 2)An induced voltage is always opposite in polarity to the applied voltage.( Counter- electromotive force, CEMF) 3)The amount of induced voltage is proportional to the rate of change of current. 4)An inductor opposes a change of current.

Three factors that determine induced voltage?

1)the number of turns of wire 2)the strength of the magnetic field 3)the speed of the cutting action( relative motion between the inductor and the magnetic lines of flux.)

Induced voltage is _____ out of phase with applied voltage and is always in opposition ti the applied voltage.

180 degrees

In a pure inductive circuit the current lags voltage by __?

90 degrees

Inductance(L) is one of the primary types of loads in ____ circuits.

AC

Why is the term called inductive reactance?

Because this reactance is caused by inductance

Circuits are generally considered to contain inductance when any type of ______ that contains a _____ is used.

Load Coil

Is induced voltage resistance?

No, but it can limit the flow of current just as resistance does.

Current limiting property of the inductor is called ____?

Reactance (X)

When inductors are connected in series the total inductance of the circuit equals the ___ of the inductance of all the inductors. also the same for total inductive ____?

Sum reactance

Type of loads that have inductance?

motors transformers lighting ballast and chokes

Inductive reactance is measured in

ohms just as resistance

Inductors connected in parallel can be found by __?

the reciprocal