The Dynamo Effect - Move the Wire or the Magnet

Question 1

What is the dynamo effect?

Answer 1

Using electromagnetic induction to generate electricity using energy from kinetic energy stores

Question 2

What is the first situation in which you get EM induction?

Answer 2

• an electrical conductor (a coil of wire is often used) moves through a magnetic field

Question 3

What is the second situation in which you get EM induction?

Answer 3

• the magnetic field through an electrical conductor charges (gets bigger or smaller or reverses)

Question 4

Look at diagram page 63

Answer 4

Ok

Question 5

How can you test this?

Answer 5

By connecting an ammeter fo a conductor and moving the conductor through a magnetic field

Question 6

What will the ammeter show?

Answer 6

The magnitude or direction of the induced current

Question 7

If the direction of movement is reversed then…

Answer 7

The induced voltage/current will be reversed too

Question 8

To get a bigger voltage, what 3 things can you increase?

Answer 8

• the strength of the magnet
• the number of turns on the coil
• the speed of movement

Question 9

Think about the simple electric motor - what have you got?

Answer 9

A current in the wire and a magnetic field, which causes movement

Question 10

How does a generator woke in comparison to a simple electric motor?

Answer 10

Opposite way round - you have a magnetic field and movement, inducing a current