Who invented the three-phase generator?

Who invented the three-phase generator?

• A. Nikola Tesla
• B. Galileo Ferraris
• C. Mikhail Dolivo-Dobrovolsky in 1891
• D. Thomas Edison

Answer: (C)

The idea being tested is how three-phase power emerged as a practical way to generate and distribute electricity. Three-phase power uses three alternating currents that are offset by 120 degrees. This arrangement delivers a more constant power flow and smoother torque to motors, making long-distance transmission more efficient and equipment-operating more reliably. The first practical three-phase generator, capable of producing three synchronized outputs for a three-phase system, was developed by Mikhail Dolivo-Dobrovolsky in 1891. His work also led to the use of three-phase transformers, which together enabled the widespread adoption of three-phase electric power. This achievement is why he’s credited with inventing the three-phase generator and laying the groundwork for modern power distribution. Other engineers made major contributions to polyphase AC theory and motors—Nikola Tesla advanced polyphase systems and motors, Galileo Ferraris contributed to the theory and demonstrations, but the specific invention of the practical three-phase generator is attributed to Dolivo-Dobrovolsky. Edison, by contrast, championed direct current.

The idea being tested is how three-phase power emerged as a practical way to generate and distribute electricity. Three-phase power uses three alternating currents that are offset by 120 degrees. This arrangement delivers a more constant power flow and smoother torque to motors, making long-distance transmission more efficient and equipment-operating more reliably.

The first practical three-phase generator, capable of producing three synchronized outputs for a three-phase system, was developed by Mikhail Dolivo-Dobrovolsky in 1891. His work also led to the use of three-phase transformers, which together enabled the widespread adoption of three-phase electric power. This achievement is why he’s credited with inventing the three-phase generator and laying the groundwork for modern power distribution.

Other engineers made major contributions to polyphase AC theory and motors—Nikola Tesla advanced polyphase systems and motors, Galileo Ferraris contributed to the theory and demonstrations, but the specific invention of the practical three-phase generator is attributed to Dolivo-Dobrovolsky. Edison, by contrast, championed direct current.