Power transformers in substations change the ______ levels to permit interconnecting of the generators and circuits forming the electrical system.

Power transformers in substations change the ______ levels to permit interconnecting of the generators and circuits forming the electrical system.

• A. Resistance
• B. Voltage
• C. Current
• D. Polarity

Answer: (B)

Transformers in substations adjust the voltage levels so the different parts of the grid can be connected and operate together efficiently. By stepping voltage up for long-distance transmission and stepping it down for distribution, they create compatible voltages for generators, lines, and loads to interconnect smoothly. While current will change with the voltage and load (I ≈ P/V), the primary purpose here is changing the voltage level. Resistance isn’t set by the transformer, and polarity is about winding orientation and phase, not the basic need to interconnect.

Transformers in substations adjust the voltage levels so the different parts of the grid can be connected and operate together efficiently. By stepping voltage up for long-distance transmission and stepping it down for distribution, they create compatible voltages for generators, lines, and loads to interconnect smoothly. While current will change with the voltage and load (I ≈ P/V), the primary purpose here is changing the voltage level. Resistance isn’t set by the transformer, and polarity is about winding orientation and phase, not the basic need to interconnect.