* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Notes Sec 4.4
Magnetometer wikipedia , lookup
Earth's magnetic field wikipedia , lookup
Maxwell's equations wikipedia , lookup
Magnetotactic bacteria wikipedia , lookup
Electrical resistance and conductance wikipedia , lookup
Giant magnetoresistance wikipedia , lookup
Mathematical descriptions of the electromagnetic field wikipedia , lookup
Magnetoreception wikipedia , lookup
Lorentz force wikipedia , lookup
Skin effect wikipedia , lookup
Force between magnets wikipedia , lookup
Magnetochemistry wikipedia , lookup
Electromagnetism wikipedia , lookup
Magnetohydrodynamics wikipedia , lookup
Superconducting magnet wikipedia , lookup
Multiferroics wikipedia , lookup
Magnetotellurics wikipedia , lookup
Electromagnetic field wikipedia , lookup
Electromagnet wikipedia , lookup
History of electromagnetic theory wikipedia , lookup
Electromotive force wikipedia , lookup
History of geomagnetism wikipedia , lookup
Alternating current wikipedia , lookup
Ferromagnetism wikipedia , lookup
Electricity wikipedia , lookup
Science 10 Chapter 4 4.4 ELETRIC GENERATORS If a current can produce a magnetic field, can a magnetic field produce a current? YES – that is what electric generators do! ELECTRIC GENERATORS: any device that can change electrical energy into mechanical energy Micheal Faraday made to the first generator in 1831 Diagram, Pg 82 - Generators produce electricity by moving a conductor through a magnetic field or by changing the magnetic field surrounding the conductor. Each procedure exerts a force on the electrons in the conductor and results in the electrons moving through it. - A coil and magnet moving back and forth act as the generator of electricity because the movement of the magnet changes the magnetic field around the coil. GALVANOMETER: is a device that can measure currents produced from an electric generator Science 10 Chapter 4 ALTERNATING CURRENT (AC current) - Current that can flow in both directions - It is produced in a generator and changes direction 120 times per second An oscilloscope is used to measure the change in direction DIRECT CURRENT (DC current) - current that can only flow in one direction - it is produced in a battery ( - to +) and only flows in one direction - explains why an ammeter needle does not change - TV’s and appliances use DC ELECTRIC MOTORS vs. ELECTRIC GENERATORS - electric motors change electrical energy into mechanical energy, therefore; they are opposite to electric generators