I know to build an inductor there is a formula to calculate the inductance, based on the wire, the number of coils and the diameter of the coil.Also, when building an inductor, can the copper wires be touching each other within the coil? Or must they be seperated?I've been trying to research inductors, and some of them touch, but some of them don't. What's the difference?Thanks
Use the solenoid self inductance formula - L ((permeability)* (turns)^2)*(area) /(length) Look it up in any Physics II textbook or Electromagnetism text. Or at least try 'inductance' in Wikipedia. The wire should be enamel insulated (typically looks amber or red), then it's OK for the windings to touch. Otherwise, they partially short each other out. You definitely want to get the windings as close together as possible. Also what you wind it on is very important. Choose a soft (low remanence) magnetic material with high permeability for the most compact inductor. Ferrite is typical. Cast iron is very good. Permalloy is nearly ideal.
every time we use wire to set up Field in a inductor we use resin to ,isolate the wires between each other
