What is one major advantage of step-up transformers?

• A. They reduce transmission losses
• B. They increase current levels
• C. They operate at lower frequencies
• D. They decrease overall energy use

Answer: (A)

A major advantage of step-up transformers is that they reduce transmission losses. Step-up transformers increase the voltage level of electricity generated at power plants before it is transmitted over long distances through power lines. By stepping up the voltage, the current flowing through the wires is decreased, since power (measured in watts) is equal to voltage multiplied by current (P = V x I). Lower current levels in the transmission lines decrease the resistive losses that occur due to the resistance of the wires, which is represented by the formula for power loss (I²R, where "I" is current and "R" is resistance). Therefore, higher voltage and lower current effectively minimize energy losses during transmission, making the energy transfer more efficient.

The other options do not accurately describe the primary advantage of step-up transformers. Increasing current levels is opposite to the function of a step-up transformer. Operating at lower frequencies is not a feature tied to the primary function of these transformers, as they are typically designed to work at the standard frequency of power systems (60 Hz in the US, for example). Decreasing overall energy use does not relate directly to the operation of a step-up transformer, since the transformation process itself does not inherently reduce energy consumption; rather, it optimizes