transformer
Construction of a transformer A transformer consists of two coils of insulated wire, called the primary and secondary coils, wound on a soft iron core. ... There are various reasons why energy is wasted in a transformer. ... The coils on the transformer are made of copper which is a good conductor. ... It is especially important that this is used on the side of the transformer which carries the high current (and low voltage). The thickest wire possible is used within the obvious constraints of keeping down the size and cost of the transformer. ... TRANSFORMERS A transformer is a device which is used to decrease or increase the voltage in circuits carrying alternating current.