2018-09-262018-09-262018http://hdl.handle.net/20.500.12091/374A transformer is an electronic device. A transformer is made of two coils of wire. The first coil is the primary coil. The second coil is the secondary coil. The primary coil and secondary coil are electrically insulated from each other. These coils are typically wrapped around an iron core. An AC Voltage is placed across the primary coil. Current in the primary coil induces current in the secondary coil. The output voltage is the voltage produced by the secondary coil. The number of turns in the coils determines the ratio of input voltage to output voltage.en-USPower SupplyArticle