Physics
Transformer is a device to convert

Mechanical energy into Electrical energy
C. to A.C.
Low voltage A.C. into high voltage A.C.
Low voltage D.C. into high voltage D.C.

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Physics
Super conductors are substances that

Conduct electricity at high temperature
Conduct electricity at low temperature
Offer high resistance to the flow of electric current
Offer minimum resistance to flow of electric current

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