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.
Alternating-current generator. A machine that converts mechanical power into alternating-current electric power. Almost all electric power is produced by alternating-current (ac) generators that are driven by rotating prime movers.