Which statements about three-phase power distribution systems are FALSE?

1. Voltage is produced by a generator.
2. All phases of a balanced system must have equal voltage, but current may be unequal.
3. Each phase is separated by 120 degrees.
4. Three-phase power is more economical to transmit than single-phase power.
5. Three-phase heavy industrial equipment generally costs more to purchase but is cheaper to operate than single-phase equipment.
6. Generator windings can be connected in a Y or Δ pattern.
7. Three-phase equipment cannot be used with single-phase equipment.
8. Three-phase transformers can consist of three separate single-phase transformers, or one three-phase transformer.
9. A balanced system has a unity power factor.