Commonly asked questions about variable transformers
How Does a Variable Transformer Work?
Variable transformers take in utility line voltage and provides continuously adjustable output voltage in the range of zero to or above line voltage. Once the equipment is connected, the voltage can be adjusted by rotating the brush tap.
What are the applications of a variable transformer?
The most common application of a variable transformer is to obtain AC voltages different from the normal 120 or 240 V, single or three-phase supply. It is also common to use variable transformers to test devices under different voltages or to simulate abnormal line voltages, controlling incandescent lamp circuits, and operating motors and other electrical equipment at various voltages.
What is the difference between variable transformers and variable autotransformers?
The difference between a variable transformer and an variable autotransformer is that the autotransformer does not have a dual-coil design. For the autotransformer, one coil is used as the primary and secondary.