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A: Transformers work with either AC or DC electricity. True/False
B: Power companies use high voltages to reduce power loss over long transmission distances. True/False
C: A(n) __________________ uses electromagnetic induction to increase or decrease voltage.
D: Materials that lose all electrical resistance at low temperatures are known as ____________________ and are ideal for constructing powerful electromagnets.
E: An electric device that uses an electromagnet to open and close a switch is a(n) ___________________.

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The answers are as follows:

A.      False –  Transformers are designed to work on AC

B.      True – This is to compensate the losses as the length of wire increases

C.      Transformer – the transformer works in the principle of electromagnetic induction

D.      Superconducting Magnet – magnet made from coils of a superconducting wire

E.       Relay – This electrical switch is operated by a magnet

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