What does the term 'burden' refer to in a current transformer?

The term 'burden' in the context of a current transformer refers specifically to the load that the transformer can handle, which is usually measured in ohms. This burden represents the total connected load on the secondary winding of the current transformer. It includes the impedance of any measuring devices, such as ammeters, and any wiring associated with the secondary circuit.

Understanding this concept is crucial because the burden affects the accuracy and performance of the current transformer. If the burden is too high, it can lead to inaccurate readings and potentially damage the transformer. Hence, the correct answer emphasizes the relationship between the current transformer and the load it is designed to support. This is an important consideration in ensuring that current transformers operate efficiently within their specified parameters.