winding. This winding is wound on laminated enameled magnetic core.
As shown in fig. 1 the input is given to winding worked as primary and output
is taken from the part of the same winding. Thus the one winding serves as primary and
secondary. This transformer is known as step down autotransformer
As shown in fig.2 the input is given to the part of winding and output is taken
across the whole winding. So the part of winding acts as a primary winding and the
whole winding acts as a secondary winding. With this construction we can step up the
voltage. So this transformer known as step up autotransformer.
