Transformers can hold anywhere between a few gallons to thousands of gallons. When a transformer fails it can lead to an intense fire and violent explosion (feel free to check out one of the many videos online on exploding transformers). This oil is similar to mineral oil and very flammable. Transformers are often times filled with oil for insulation, to prevent electrical arcing and to serve as a coolant. The most common transformer that people often see are located on telephone poles. They have been in use for a long time and are an essential piece of our electrical infrastructure. This is done for several reasons, but two main purposes are to reduce the voltage of conventional power circuits to operate low-voltage devices and to raise the voltage from electric generators so that electric power can be transmitted over long distances. In basic terms a transformer is a device that transfers electric energy from one AC circuit to another, either increasing or reducing the voltage. What are transformers and what do they do? While superheroes and the big box office may have everything thinking about robots when we talk about transformers, they are actually a much more important device that is essential for the transmission, distribution, and utilization of alternating current electric power.
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