A variable autotransformer is a type of transformer that allows the output voltage to be adjusted over a continuous range. It consists of a single winding that acts as both the primary and secondary winding, with a movable tap that varies the output voltage. This adjustability makes it useful for applications requiring precise voltage control, such as laboratory experiments, test equipment, and voltage regulation.
A variable autotransformer operates by varying the position of the movable tap on a single winding.
By changing the position of the tap, the voltage ratio between the primary and secondary parts of the winding is changed, thereby adjusting the output voltage. The primary winding is connected to the input voltage and the secondary output voltage is taken from the tap, allowing the user to select any voltage within the transformer’s range. This design provides a smooth and adjustable output voltage.
A variable transformer, often synonymous with a variable autotransformer, is a transformer designed to provide an adjustable output voltage.
The term “variable transformer” refers broadly to transformers that can change their output voltage in response to changes in their parameters. It encompasses devices such as the variable autotransformer, which uses a movable tap to continuously change the output voltage.
An autotransformer is a type of transformer that has a single winding that serves as both the primary and secondary winding. It provides voltage transformation by electromagnetic induction and is used for applications requiring voltage adjustment, such as power supplies and voltage regulation systems.
Autotransformers are efficient and compact compared to conventional transformers because they use fewer materials and are able to handle a range of voltage changes.
A Variac autotransformer is a specific brand of variable autotransformer known for its continuous voltage adjustment capability. Variac is a brand name used to describe a particular type of variable autotransformer that allows users to smoothly vary the output voltage from zero up to the maximum rated voltage.
It is widely used in laboratories, test equipment and applications requiring precise and reliable voltage control.