Which is an advantage of ac over dc power?

a. ac voltage can be transformed into other voltages through transformers.

b. ac voltage is more easily used in the home.

c. ac circuits are safer.

d. it's easier to produce ac voltage with a portable, chemical battery.

its a

The correct choice is

A. AC voltage can be transformed into other voltages through transformers.

Explanation:

We can convert an AC Voltage to other higher or lower voltage making use of a step up or step down transformer. Electricity is transferred over long distances at high voltages as the losses are minimum at high voltage. The electricity can not be used in households at such high voltage. So the high voltage is converted to low voltage using transformers. This can only be done in case of AC Power.

a electromagnetic waves

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray