Final answer:
The hot legs of a 3 phase generator carry a voltage in a three-phase system, and electric generators use mechanical energy from sources like water, steam, or wind to induce an AC current.
Step-by-step explanation:
The hot legs of a 3 phase generator have a voltage that powers the connected load in a three-phase electrical system. Electric generators function by rotating a coil in a magnetic field, which induces an alternating current (AC) due to the mechanical energy provided by various sources like hydropower, steam from fossil fuels, or wind energy. In the case of a 3-phase generator, there are three coils (hot legs) that are spaced 120 degrees apart, which creates a three-phase voltage that is useful for powering large motors and other heavy loads. Each hot leg carries a part of the total power output, and together they deliver a balanced and continuous flow of electricity. Moreover, the design of electric generators and turbines, as noted, includes considerations for efficiency, where factors like optimal rotor speed and the reduction of mutual inductance in electric appliances such as dryers are key elements to efficiency and safety.