Final answer:
A 3-phase motor for high voltage use is connected on line voltage. Home appliances are connected in parallel, and transformers adjust voltage levels for home use or long-distance power transmission. High voltage is critical for the efficient transmission of electricity along power lines to reduce power losses.
Step-by-step explanation:
A 3-phase motor is connected on line voltage for high voltage. This configuration is typically used to power industrial equipment because high voltage is needed for efficient transmission along power lines from the electrical power plant. The transformers are used in the transmission process to step down the high voltages in transmission lines to the 110 to 220 V used in homes.
For household appliances, the wiring is typically done in parallel to ensure that each appliance receives the same voltage as opposed to series wiring which would divide the voltage across appliances. In a transformer, the voltage can step up or down depending on the ratio of turns in the coils, typically primary voltage is higher than secondary voltage to step down for household use and vice versa for transmission.
High voltage transmission lines, which you may see connected to tall towers, are necessary to minimize power losses over long distances.