Which defines the capacity of an outlet?

The capacity of an outlet primarily refers to the amount of current it can safely supply to connected devices or utilization equipment. This current rating is typically expressed in amperes and is crucial for ensuring that the outlet can handle the electrical load without overheating or risking damage. Adhering to the specified current capacity is essential for safe and effective operation, as exceeding this limit can lead to hazards such as electrical fires or equipment failure.

In contrast, the other options address different aspects of electrical systems. The total number of devices connected does not directly equate to the outlet's capacity without considering the total current drawn by those devices. The maximum voltage allowed is important but does not define capacity in terms of how much current can be supplied. Lastly, the physical size of the outlet might affect installation but does not correspond to its electrical capacity. Thus, understanding the current supply to utilization equipment is fundamental in determining how much load an outlet can manage safely.