Question

At which stage of the power transmission is the step-up transformer used?

• A. Before transmitting power to a long distance
• B. After transmitting power to a long distance
• C. At a sub-station
• D. Before the distribution transformer

Answer 1

The correct option is A Before transmitting power to a long distance

A step-up transformer is used at the power station before transmitting power (At power transformer) to a long distance by high tension (H.T) line as this reduce the energy loss in transmission lines, dissipated as heat.

Current through the conductor (C) = $\frac{Power\left(P\right)}{Voltage\left(V\right)}$

Hence, higher the voltage, the lower the current. The lower the current, the lower the energy loss.