What electrical function do switches primarily perform?

Switches primarily perform the function of manipulating high current and voltage within an electrical circuit. They operate by either opening or closing a circuit, allowing or stopping the flow of electric current. This capability is essential for various applications, from household appliances to industrial systems, where controlling the operation of devices is necessary for safety and functionality.

In many instances, switches are designed to handle specific voltage and current ratings to ensure reliable operation without risking damage or hazards. Their fundamental role is to provide a straightforward mechanism for users to control electrical devices safely, thereby making them a critical component in electrical systems.

The other options describe functions that do not align with the primary role of switches. Enhancing circuit efficiency generally involves components such as capacitors or inductors. Transformation of electrical energy is a function performed by transformers. Providing energy storage is the role of batteries and capacitors, which maintain energy for later use, rather than the direct on/off control that switches provide.