The capacity for work or vigorous activity; vigor; power. The capacity of a physical system to do work. energy. The capacity or power to do work, such as the capacity to move an object (of a given mass) by the application of force. Energy can exist in a variety of forms, such as electrical, mechanical, chemical, thermal, or nuclear, and can be transformed from one form to another.
Freebase (0.00 / 0 votes) Rate this definition: Switch. In electrical engineering, a switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another.
REVIEW: 1  A switch is an electrical device, usually electromechanical, used to control continuity between two points. 2  Hand switches are actuated by human touch. 3  Limit switches are actuated by machine motion. 4  Process switches are actuated by changes in some physical process (temperature, level, flow, etc.).