Which of the following are types of electrical current?

The correct choice identifies AC (Alternating Current) and DC (Direct Current) as the two primary types of electrical current.

AC is characterized by the flow of electric charge that periodically reverses direction. It is the form of electrical current commonly used in homes and businesses due to its efficient transmission over long distances. The voltage in an AC system also varies sinusoidally, allowing for the easy transformation of voltage levels using transformers.

DC, on the other hand, is characterized by the unidirectional flow of electric charge. It is commonly utilized in batteries and electronic circuits, where a constant voltage is required. Devices that use DC power often rely on this stable current for proper functionality.

While other options mention components related to electrical systems, they do not accurately denote the fundamental types of electrical current in the same straightforward manner. Therefore, AC and DC are the foundational classifications that clearly highlight the differing ways electrical current can behave in a circuit.