TRANSFORMERS

Defines transformer action, step-up and step-down, turns ratio, and coefficient of coupling. Gives examples of determining the step-up or step-down ratio and coefficient of coupling. Describes and illustrates the relationship between the magnitude of voltage and current in a transformer. Shows the symbols of power, audio, RF, and auto-transformers. Demonstrates the procedure for testing a transformer for opens and shorts, and how to identify a step-up or a step-down type transformer. (Kinescope)