Albert Teen YOU ARE LEARNING:  What Is the Generator Effect?  # What Is the Generator Effect? ### What Is the Generator Effect?

We can induce voltage in a wire by moving a magnetic field relative to the wire.

What is it that makes a current move around a circuit? How can you induce potential difference across a current-carrying conductor? Pick all the options you think are correct. What do we call it when we induce potential difference in a current-carrying conductor? What do you think might be another name for electromagnetic induction? The generator effect describes how we can generate a potential difference with electromagnetism. There are two ways this can be done.

1

First, we can move a closed-circuit wire through a stationary magnetic field.

This generates a current through the wire!

2

Secondly, we can move a bar magnet through a closed-circuit coil of wire.

This also generates a current through the wire! We will now look at an experiment that demonstrates this effect.

But first, can you remember what we use to measure the current in a circuit? 1

What is the current, when the magnet is stationary?  2

As the magnet moves further into the coil, what happens to the current reading on the ammeter?

A) Increases B) Decreases C) Stays the same  3

What happens to the current reading on the ammeter when the magnet has moved fully into the coil and has stopped moving?

A) Positive B) Negative C) Back to zero  4

As the magnet is moved back out of the coil, what happens to the current reading on the ammeter?

A) Positive B) Negative C) Zero  5

As we move the magnet in and out of the coil of wire the ammeter reading changes.

As the magnet moves into the coil, the ammeter shows a positive current. As it moves out of the coil, the ammeter shows negative current. When the magnet is stationary, there is zero current.

This shows how a magnet moving in and out of a closed-circuit coil of wire generates current through the wire. 