Inductor

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# Inductor - PowerPoint PPT Presentation

Inductor. A circuit component designed for inductance is an inductor . Symbol suggests coiled wire Ideal inductors act like wires unless the current changes. Emf based on L Real inductors have some resistance. Resistivity of length of wire. Physical Coil.

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## PowerPoint Slideshow about ' Inductor' - griffith-ward

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Presentation Transcript

### Inductor

A circuit component designed for inductance is an inductor.

Symbol suggests coiled wire

Ideal inductors act like wires unless the current changes.

Emf based on L

Real inductors have some resistance.

Resistivity of length of wire

Physical Coil
An inductor resists changes in current.

Creates emf

A switch can be used to complete a circuit with a resistor.

One-loop Kirchhoff’s law

RL Circuit

L

I(t)

V

R

The voltage across an inductor falls with time.

Change in current decreases

Never reaches zero

Overall current increases

The period of time for a decrease by a factor of e is the time constant t.

Inductive Time Constant

Depends on battery voltage

Exponential Decay
Inductor and resistor voltages sum to battery voltage.

Kirchhoff’s voltage law

Circuit current can be determined from Ohm’s law

Inductor Current

The inductor will create an emf to resist the change.

For a large current the emf can create a spark.

Disconnection

L

I(t)

V

R

A pair of opposite switches can provide a safe path for current in an inductor.

A and B always in opposite position

When switch A is closed the battery powers the circuit.

When switch B is closed the inductor current flows through the switch and resistor.

Safe Discharge

L

SA

I(t)

V

R

SB