Discounts: 1  The American Board of Opticianry offers a voluntary certification program for dispensing opticians. 2  Books and supplies vary by school around $300-$800 per year. Given twice a year, opticians may take either the National Opticianry Competency Exam or the Contact Lens Registry Examination at $150 each. 2  Certificates require renewal every three years with continued education requirements. 3  Books and supplies vary by school around $300-$800 per year.
An electrical generator is a device that generates electricity from mechanical energy, usually via electromagnetic induction.n a diesel-electric locomotive, a diesel engine provides power to an electric traction motor that turns the unit's wheels. Generators often rely on gas-powered motors for operation when creating electricity. A turbine designed to generate energy from the wind.
While the generator and the vacuum (or any other device powered by a motor) may serve different functions, they are actually two sides of the same coin. In fact, they are the same device! In an electrical motor, the input is electricity and the output is mechanical power. Contrary to this, a generator takes mechanical power and outputs electricity. In both cases, electricity is flowing - just in a different direction! Electromagnetism. Both motors and generators run because of something called electromagnetic induction. Discovered by Michael Faraday, this is when a voltage is induced by a changing magnetic field. With electromagnetic induction, an electric current can be produced in a coil of wire by moving a magnet in or out of that coil, or by moving the coil through the magnetic field. Either way, voltage is created through motion.