Which device is used to reduce high voltages in electrical power transmission?

Transformers are the devices specifically designed for the purpose of reducing high voltages in electrical power transmission. They operate on the principle of electromagnetic induction, which allows them to increase or decrease voltage levels while transferring electrical energy. In high-voltage power transmission systems, transformers are essential because they enable electricity to be transmitted over long distances with reduced energy losses. By stepping down the voltage before the electricity reaches homes and businesses, transformers ensure that the electrical power can be used safely and efficiently at lower voltage levels, which are suitable for everyday usage.

The other devices mentioned serve different functions in the electrical system. Resistors, for example, are used to control current flow and can dissipate energy as heat but do not change voltage levels effectively for power transmission. Batteries provide stored electrical energy and are not used to manage voltage levels in transmission systems. Generators produce electrical energy from mechanical energy but play no role in changing voltage levels in the context of power transmission. Thus, transformers are the appropriate choice for reducing high voltages.