How are step-up transformers used in the transmission of electrical energy? a they decrease the voltage before it leaves a power plant. b they increase the voltage for efficient long-distance transmission. c they increase the current for efficient long-distance transmission. d they increase the voltage and the current for a short distance transmission

B

Explanation:

Transformer is a device used to convert low a.c. voltage to high a.c. voltage and vice versa.

There is two types of transformer, they are:

1.Step up transformer

It converts low a.c. voltage into high a.c. voltage.

2.Step down transformer

It converts low a.c. voltage to high a.c. voltage.

15.3 cos 65 degrees trig

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