In a three-phase generator, when one phase is at zero, what are the other two phases doing?

In a three-phase generator, when one phase is at zero, what are the other two phases doing?

• A. At random
• B. Providing power to the circuit
• C. Providing no current
• D. At zero potential as well

Answer: (B)

In a three-phase system, the three voltages are 120 degrees apart, so at any moment more than one phase is active. When one phase happens to be at zero voltage, the other two phases still have nonzero voltages and carry current. That means both of those phases are delivering power to the load, keeping the overall power flow steady. The two active phases aren’t random or at zero potential; they remain the ones supplying energy while the third phase is momentarily crossing zero. This is why the correct idea is that the other two phases are providing power to the circuit.

In a three-phase system, the three voltages are 120 degrees apart, so at any moment more than one phase is active. When one phase happens to be at zero voltage, the other two phases still have nonzero voltages and carry current. That means both of those phases are delivering power to the load, keeping the overall power flow steady. The two active phases aren’t random or at zero potential; they remain the ones supplying energy while the third phase is momentarily crossing zero. This is why the correct idea is that the other two phases are providing power to the circuit.