Increasing the number of turns on the coil of wire The image below illustrates a simple experiment to demonstrate electromagnetic induction. The direction of a motor effect force can be found ...

The primary side of a Tesla coil is usually a handful of turns of thick wire to handle the current without melting. This build runs at two or three amps, giving a primary power of around 150 Watts.

Wrap the 4-inch nail with a coil of 25 to 50 turns of the wire. Connect one end of the coil to one terminal of the knife switch. Connect the other terminal of the knife switch to the battery.

A second experiment can be carried out to investigate how the strength of the electromagnet depends on the number of turns in the coil. As the number of turns increases the number of paper clips ...