Current can produce magnetism Lesson 3.2 Current can produce magnetism

Electric current produces a magnetic field Electromagnetism – magnetism that results from an electric current Movement of charged particles produces a magnetic field Therefore moving electrons can create a magnetic field around a wire

Magnetism is concentrated inside the loop of wire Magnetic force gets stronger by adding more coils of wire North pole forms at one end, south pole at the other

Electromagnets Made by placing an iron core inside a coil of wire Current through the wire creates magnetism Adding coils or more current strengthens the magnetism Most powerful magnet

Uses of electromagnets Magnets on cranes Computer hard drive Sound/movie film motors Can be turned on and off

Electromagnets & Motors http://www.youtube.com/watch?feature=player_detailpage&v=it_Z7NdKgmY Motors convert current into motion by using magnetism Electromagnet interacts with a magnet causing opposite poles to attract and unlike poles to repel Movement or spinning is created

Uses of Motors Motors can move objects in any direction Can be large enough to power a train or car Small enough to run a watch