Question T6C09
From subelement T6 - T6C
What is component 4 in figure T-2?
Why is this correct?
Component 4 in figure T-2 is a transformer, which changes AC voltage levels using electromagnetic induction between coils. The schematic symbol shows the characteristic dual coil configuration around a core. Variable inductors have different symbols, double-pole switches show mechanical contacts, and potentiometers display a resistor with an adjustable tap. Transformers are essential for converting 120V AC wall power to lower voltages needed by radio equipment.
Memory tip
Learn to recognize transformer symbols by their distinctive coil pairs - they always show two or more coiled inductors near each other, often with parallel lines representing the iron core between them. This visual pattern immediately distinguishes transformers from other components in circuit diagrams.
Learn more
Transformers enable voltage conversion in amateur radio power supplies, taking high-voltage AC from wall outlets and stepping it down to safe operating voltages for transceivers and amplifiers. They also provide electrical isolation between circuits, preventing ground loops and reducing noise. In RF applications, transformers can match impedances between transmission lines and antennas, optimizing power transfer according to maximum power transfer principles outlined in Part 97 emission standards.
Think about it
Why do you think transformers require AC voltage to operate effectively, and what would happen if you tried to use a transformer with pure DC voltage?