Question

why transformer dtart from set up​

Answer 1

Answer:

An autotransformer is used mainly for the adjustments of line voltages to either change its value or to keep it constant. If the voltage adjustment is by a small amount, either up or down, then the transformer ratio is small as VP and VS are nearly equal. Currents IP and IS are also nearly equal.

Answer 2

Answer:

A transformer in which the output (secondary) voltage is greater than its input (primary) voltage is called a step-up transformer. The step-up transformer decreases the output current for keeping the input and output power of the system equal.

Considered a step-up transformer shown in the figure below. The E1 and E2 are the voltages, and T1 and T2 are the number of turns on the primary and secondary winding of the transformer.