Exam 14: Transformers

A step -up transformer will increase and decrease .

If a dc voltage is input to a transformer's primary, then an ac voltage is induced in its secondary.

An autotransformer differs from most transformers in that:

If a 12 V battery is connected across the primary of a transformer with a turns ratio of 1:4, then the secondary voltage is .

-if the primary to secondary turns ratio is 7.5:1, the output voltage equals .

If you wanted to monitor a large alternating current without opening the circuit you would likely use a _.

Although the input voltage to the transformer's primary is correct, the transformer is outputting zero volts. A probable trouble is .

What is the problem if a power transformer is delivering a low output voltage even though the primary voltage is correct?

The efficiency of all transformers is very low.