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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.

Inductor

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## 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

The emf of an inductor can be represented by an exponential curve.

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

Opening a switch with current flowing is a change in 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.

L

SA

I(t)

V

R

SB