Electric power lesson 6

OUTCOME

By the end of the lesson you will recognise the contribution of Faraday and Lenz to our understanding of EM induction. you will be able to apply the idea of magnetic flux to problems qualitatively and quantitatively.

Magnetic flux is the measure of a magnetic field over an area and is calculated by

Φ = B x A, where B and A are perpendicular.

A current is induced when there is: changing magnetic flux (do this by altering B or A).

https://phet.colorado.edu/sims/html/faradays-law/latest/faradays-law_en.html

LEARNING TASKS

Explain

1. What factors will increase the amount of flux through a loop?

2. What factors would effect the size of the induced current in a loop?

3. What would happen if a loop was placed in a field at 45^o

Explore and Elaborate

Prac: Electromagnetic Induction

Look at the first two experiments...

Q - what situations resulted in a current

Q - can you explain the reversal of the current?

Prac: Bouncing magnets

Evaluate

Exercise 4.4

p.140 (Jac)