Complete the sentence.
electric current from a generating plant is
a. direct current transmitted at high voltages, but usually used at low voltages.
b. alternating current transmitted at high voltages, but usually used at low voltages.
c. alternating current transmitted at low voltages, but usually used at high voltages.
d. direct current transmitted at low voltages, but usually used at high voltages.

b. alternating current transmitted at high voltages, but usually used at low voltages.

Explanation:

As we know that transformer is used to convert high voltage AC to low voltage or vice versa.

Here this AC voltage is transmitted at high voltage conditions because here power remains constant.

this power is given by

now if we increase the voltage then the current will be less due to which the heat loss in transmission line is small

now when we need to supply it to the homes we will have to decrease the voltage by using the transformer again