Why and which type of transformer do we use to reduce power loss during transmission?

Question

Accepted Answer

We use step-up transformers to reduce power loss during transmission by increasing voltage and decreasing current.

Step-up transformers increase voltage and decrease current, which reduces power loss during transmission.
This is because power loss is proportional to the square of the current, so reducing current reduces power loss.
For example, power is transmitted over long distances at high voltages (e.g. 500 kV) to reduce power loss.
Step-down transformers are used at the end of the transmission line to decrease voltage to safe levels for use in homes and businesses.
Transformers also help to isolate different parts of the power grid and prevent electrical interference.

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