Question

-In the transmission of power, the voltage of the power generated at the generating stations is stepped up from 11Kv to 132kV before it is transmitted. Why?

Answer 1

Hint: For solving this question, You will use the energy equation here, and by the use of the relationship between power and voltage, you will be able to solve the question.

Complete step by step answer:
The power is transmitted through the wires to the distribution stations from the generating station. The power loss is the major problem in transmitting the electricity because the power is lost in terms of heat. The heat also creates a problem for the wires because heating damages the wire and reduces its strength.
The power loss expression is given by $P = {I^2}RT$, Where I is current, and R is the resistance.
The current is very high at low voltage, so according to the above expression, the power loss is also high.
If we write the above expression in the form of voltage
We replace $i = \dfrac{P}{V}$
So the power expression will be $P = \dfrac{{{P^2}}}{{{V^2}}}R$
So, $P \propto \dfrac{1}{{{V^2}}}$
From this expression, we can clearly see that the power loss is inversely proportional to the square of the voltage. So if the voltage is low, then there is more power loss than the high voltage. Hence, the voltage of power generated is increased from 11kV to 132kV before transmission to reduce power loss. Power transmission is the large electricity movement from generating stations to the electrical substations and further to various industries and houses for daily usage. There are interconnected lines that ensure the power transmission and power transmission is done through the cables. The electrical energy last station is a distribution station from here the electricity is distributed to customers.

Note:
Here we used the power and voltage relationship to describe the function of stepping up the voltage. You may be confused here in power and energy formulas.
The power loss is the major problem in transmitting the electricity because the power is lost in terms of heat.