Transformers
This online engineerng PDH course explains how transformers convert between high and low voltages, change impedance, and provide electrical isolation between circuits.
A transformer is an electrical device that transfers energy from one circuit to another purely by magnetic coupling. Transformers are often used to convert between high and low voltages, to change impedance, and to provide electrical isolation between circuits.
A basic transformer consists of two sets of coils or windings close to each other (sometimes wrapped around an iron or ferrite "core"). Each set of windings is simply an inductor. Power is fed into one coil (the "primary"), which creates a magnetic field. The magnetic field causes current to flow in the other coil (the "secondary"). The alternating current that flows through the primary winding establishes a time-varying magnetic flux, some of which links to the secondary winding and induces a voltage across it. The number of times the wires are wrapped around the core ("turns") is very important and determines how the transformer changes the voltage.
This 4 PDH online course is applicable to electrical engineers, design and construction personnel, technical staff and facility personnel who are interested in gaining a better understanding of transformers.
This PE continuing education course is intended to provide you with the following specific knowledge and skills:
- Understand transformer action and its physical characteristics
- State the difference in construction between a high and a low voltage transformer
- State the meaning of a "no-load condition" and "exciting current"
- State the meaning of leakage flux and its effect on the coefficient of coupling
- Identify a transformer as step up or step down and state the current ratio of a transformer when given the turns ratio
- State the mathematical relationship between the power in the primary and the power in the secondary of a transformer
- State the three power losses in a transformer
- List five different types of transformers according to their applications
- State the general safety precautions when working with transformers
In this professional engineering CEU course, you need to review Chapter 5 of Module 2 titled "Transformers" of the Naval Education and Training Materials (NAVEDTRA 14174), Electricity and Electronic Training Series.
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