People noticed long ago that at transmission of electric current via the coil which is reeled up from a metal wire the magnetic field is created. And if to place in this coil any metal, a ferromagnetic (iron, cobalt, nickel, etc.), then the efficiency of magnetic field increases in hundreds, and even in thousands of times. And the electromagnet which is an irreplaceable part of many electrotechnical devices also presently was born.
It is required to you
- Nail, flat-nose pliers, the enameled wire, kembrik (isolation from wires), the power supply, paper, an insulating tape.
Instruction
1. Take a thick nail and bite off with flat-nose pliers from it a sharp tip. Process the place of a cut a file, so that the face of a nail was equal and smooth. Then, burn it in the oven, let's him cool down on air and clean off from a deposit.
2. Further, the nail needs to be isolated, put on it kembrik and on both sides establish plastic washers that the winding did not go beyond a kembrik.
3. Take the enameled wire and it is dense, a round to a round reel up it on kembrik when you reel up one layer, wrap up it in paper and reel up following. The more you will reel up rounds, the more there will be an efficiency of an electromagnet. After the end of winding remove wires outside, wrap up the last layer of a winding in paper and roll up an insulating tape. Clean the ends of wires from enamel and connect them to a current source, the electromagnet will attract to itself metal objects.