Answer / sowmya

actually both mean the same and may differ in some cases.....
because both are used to vary the voltage....

Answer / sajid m

auto transformer secondary is provided by taps that are
fixed in the winding but varic secondary voltage is providig
a sliding tip along the all of winding

Answer / ch.phani

autotransformer is just like a normal transformer provided
with tappings
but with variac any variation in the given range is possible
for example a 230v/270 v variac is used to vary the voltage
in range of (0-270)v

Answer / sunil datta

An auto transformer operates automatically and variac
manually.

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