Electricity and Magnets are connected in a special way. In physics, we say the fields are "unified." Here we will build some circuits and observe the connections between electricity and magnetism.
Experiment with Compass and Electricity
Review, what is a compass needle, what makes it point in a particular direction.
Use the electrical current to move the needle.
This image shows what happens when there is no current in the wire. Push the button and see what happens:
Why did the compass needle move?
It is a magnet that moves the compass so ... electrical current creates a magnetic field.
Try the same but with the compass need under the black wire. Is the result the same, similar or different. Why?
The magnetic field produced by a current in a wire can be increased by adding many turned of a wire. A magnetic material such as iron in a steel screw will help to direct the magnetic field making the magnet "stronger"
What happens if the electromagnet is lifting several metal pieces (screws or paperclips) and the current is turned off?