A Stronger Electromagnet

We already know that we can make an electromagnet stronger by adding an iron core

There are other ways to make it stronger:

Make a coil with more turns of wire. The wire is longer so when the electric current flows through it, the magnetic field is stronger

Another way is to make a bigger flow of electric current through the coil of wire. Connect two batteries to the coil instead of one. This will make a larger magnetic field.

The batteries must be connected end to end as shown in the diagram

If you use two batteries instead of one, you will have twice the amount of electric current in the electromagnet

We measure electric current with an ammeter

Electric current is measured in units called amps (symbol: A)