Inductors

Introducing Coils / Inductors

Coils / Inductors (Part 1)

GreatScott - 6 min

Coils / Inductors (Part 2) || Reactance in AC

GreatScott - 5 min

YouTube videos:

Understanding Inductance, Types and Applications - Inductors (5 min)

The Ultimate Guide to Understanding Inductance and Inductors (3 min)

Faraday's Law of Induction and Lenz's Law

This is the foundation for understanding indiction and we have covered most of these concepts in Year 12. So, it is worthy to have a quick recap and then apply these two laws in a new domain.

Faraday's Law - Demonstration

A great demonstration done by Prof. Melloch at Purdue University in 2013.
From 0:00 to 2:14 for the demonstration, the formula showed after that is in calculus and for university levels.

Flux and emf explained

PhysicsHigh - 5 min

Faraday's Law - Demo and Explained

PhysicsHigh - 9 min

Back emf Demo

The Demo Guy Cal Poly SLO - 30 sec

Back emf explained

PhysicsHigh - 7 min

Inductors

emf - Electromotive Force

EMF, or electromotive force, refers to the voltage created by a battery or by a changing magnetic field.
Counter EMF, also called Back EMF, is a related phenomenon that we will illustrate in this animation.

Inductance - important

How big is One Henry (1 H) of inductance?
SciPad p.304

Inductors and Inductance

8 minutes

Inductors Explained

10 minutes

Time constant of RL circuit

Compare Time Constant between RC and RL circuits
SciPad p.306-308
YouTube - Time constant of RL circuit

Mutual inductance

Self-inductance & mutual inductance

Both ΔΦ/Δt and dΦ/dt means "the rate of changing magnetic flux".
SciPad p.309
YouTube - Self-inductance & mutual inductance

Transfermer

Transformers

10 minutes
SciPad 310-316

Electric Transmission Lines

10 minutes

Discussing some of the fascinating engineering that goes into overhead electric power transmission lines.

Eddy Currents

Eddy Currents and Magnetic Braking of a Pendulum

Eddy Currents Explained

Review Questions:

Use these questions to test your understandings, whether you can ...

Calculate magnetic flux.
Use Faraday's and Lenz's laws to explain induced EMF.
Solve Faraday's law problems.
Explain the concept of self-induction.
Solve problems involving self-inductance.
Describe the purpose of inductors.
Explain how energy is stored in an inductor.
Calculate the amount of energy stored in an inductor.
Describe the time constant for an RL circuit.
Calculate the time constant for an RL circuit.
Explain how a transformer works.
Calculate the voltage and current in ideal transformers.
Calculate the voltage and current in real transformers.
Describe the purposes of, and differences between, step-up and step-down transformers.
Describe what an isolating transformer is, and explain how they work.

Induction

End of Chapter Review

Electromagnetic Induction

An induced emf is produced by a changing flux

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