In electrical terms, what is the usual definition of 'capacity'?

Capacity, in electrical terminology, typically refers to the maximum power that a device can handle without failure. This definition encompasses the limits of current, voltage, and temperature that a device can safely sustain during operation under various conditions. For instance, transformers, generators, and circuit breakers all have defined capacities that indicate the maximum load they can handle. Understanding capacity is essential for ensuring that electrical systems operate safely and efficiently, allowing for optimal performance without risk of overload or damage.

The other choices, while related to energy and performance, focus on different aspects. The energy a device can store relates more to devices like capacitors or batteries, emphasizing their ability to hold charge rather than their operational limits. The average energy loss typically addresses inefficiencies in systems, such as heat loss in conductors, which is not directly tied to capacity. Lastly, power output under load refers to the actual performance of a device when connected to a load, which may vary from its determined capacity due to other factors such as environmental conditions or the specific design of the system.