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1
ES309
Elements of Electrical Engineering
Lecture #13
Jeffrey Miller, Ph.D.
Outline
. Chapter 6.1-6.2
Inductors
. An electrical component that opposes any change
in electrical current
. Composed of a coil of wire wound around a
supporting core whose material may be magnetic
or non-magnetic
. A time-varying magnetic field induces a voltage in
any conductor linked by the field
. Inductance
- Relates the induced voltage to the current
Inductors
. Inductance is the circuit parameter used to
describe an inductor
. The letter L is used for inductance, measured in
henrys (H)
- henry=> Wb/A => V * s / A
2
Inductors
v = L di/dt
where v is in volts, L in henrys, i in amps, and t in
seconds
If the current is in the opposite direction of the voltage
drop across the inductor, the equation will be negated
Inductors
. Looking at the equation
v = L di/dt
. If the current is constant . . .
- The voltage across the inductor is 0
- So the inductor behaves as a short-circuit in the
...

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