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

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

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