What does a transformer do (electricity)??
A transformer uses what’s known as “induction” to change voltage. Transformers don’t create energy, the overall amount of power remains the same. But they can be used to increase or decrease voltage. For transmitting power over long distances, you need high voltage. So power companies step up the voltage with transformers to several thousand volts. Distribution lines, which are on top of the wooden poles you probably see around your neighborhood, are typically 15,000 volts. Longer distance transmission lines (on steel towers) can be 200,000 volts or more. The voltage is then stepped back down with transformers to 120 volts or 240 volts to supply power to homes and businesses. Transformers can work either way, to increase or decrease voltage. Transformers that increase voltage are called “step up” transformers. A transformer has two coils of wire, called the “primary winding” and the “secondary winding.” Have you ever made an electromagnet by winding a wire around or nail or something?
