Concept:A step-up transformer is a device that increases the voltage from its primary coil to its secondary coil.
Explanation:It operates on the principle of electromagnetic induction.
The secondary coil has more turns of wire than the primary coil.
This turns ratio determines the voltage change:
Vs​/Vp​=Ns​/Np​, where
Ns​>Np​.
Therefore, the output voltage is higher than the input voltage.
Step-up transformers are used in power transmission to raise the voltage level.
Raising voltage reduces the current for the same power, which minimizes resistive losses (
I2R) over long distances.
Ideally, a transformer does not change the electrical power (
P=VI remains constant, ignoring losses).
Hence, step-up transformers are not meant to increase or decrease power.
They also do not decrease voltage; that is the role of a step-down transformer.
Thus, the correct purpose is to increase voltage.
Answer:Increasing voltage