MEEN 225 Lecture Notes - Lecture 17: Root Mean Square

• School: Texas A&M University
• Department: Mechanical Engineering
• Course: MEEN 225
• Professor: John Steven Haglund

Document Summary

A device that converts ac voltage from one level to another thru" the action of magnetic field. Can be subdivided into two:: step-down transformer - convert higher voltage to lower voltage. o. Step-up transformer - convert lower voltage to higher voltage. Enable transmission of electrical energy over great distances. Consists of two or more windings placed on the same iron core. Iron core: made up of laminated iron core having magnetic conducting quality (high permeability, magnetic field produced tends to be confined to the paths defined by the structure if we use high-permeability material. If there is load connected, the transformer is said to be on load condition. Consider a coil which surrounds a variable flux . The flux alternates sinusoidally at freq f, reaching +ve and ve peaks max. A sinusoidal flux, induces a sinusoidal voltage, e. The ac flux may come from ac current that flows in the cct, a moving magnet or a nearby ac coil.