Question

Define alternating current and direct current. Explain why alternating current is preferred over direct current for transmission over long distances. ​

Answer 1

As seen in the first equation, the power lost through transmission is proportional to the square of the current through the wire. ... This is why alternating current is preferred over direct current for transmitting electricity, as it is much cheaper to change the voltage of an alternating current

Answer 2

Answer:

Alternating Current (AC) is a type of electrical current, in which the direction of the flow of electrons switches back and forth at regular intervals or cycles.

Direct current (DC) is the one directional or unidirectional flow of electric charge. An electrochemical cell is a prime example of DC power.

In AC, voltage transformation to higher(and also lower) values is easier at constant power. So, voltage is increased before transmission reducing current and hence reducing transmission losses.

Explanation:

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