Inductor
This presentation is the property of its rightful owner.
Sponsored Links
1 / 8

Inductor PowerPoint PPT Presentation


  • 94 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

Inductor

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Inductor

Inductor


Physical coil

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


Rl circuit

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

Treat as additional emf source

RL Circuit

L

I(t)

V

R


Inductive time constant

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


Exponential decay

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

Depends on battery voltage

Exponential Decay


Inductor current

Inductor and resistor voltages sum to battery voltage.

Kirchhoff’s voltage law

Circuit current can be determined from Ohm’s law

Inductor Current


Disconnection

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


Safe discharge

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


  • Login