transformer
n. countablen. a piece of equipment that changes the voltage of electricity. It can make the power stronger or weaker so it is safe to use in your home.
n. an apparatus for reducing or increasing the voltage of an alternating current. Operates on the principle of electromagnetic induction between two or more coupled circuits.
The transformer on the pole reduces the voltage for the neighborhood.
You need a travel transformer to use your hair dryer safely in a country with different electrical standards.
High-voltage electricity is transmitted over long distances to minimize energy loss, then passed through a step-down transformer before entering residential distribution lines.
From transform + -er.
Commonly modified by 'step-up' or 'step-down' to indicate the direction of voltage change.