In the old days of Cathode Ray Tubes, the beam is controlled by a circular transformer around the yoke or long part of the CRT.
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yes we can place auto transformer in place of original transformer
A transformer that increases voltage is a step-up transformer.
An isolation transformer is usually a ferromagnetic transformer. The question needs to be framed more usefully.
because the copper is saved in the auto transformer that is the ratio of weights of copper in auto transformer to normal transformer is (1-(1/a)) where a is transformer ratio
The difference between current transformer and potential transformer is that the secondary of a current transformer can not be open circuited while under service whereas that of the potential transformer an be open circuited without any damage to the transformer.