In electrical engineering, what does the symbol 'I' represent?

In electrical engineering, the symbol 'I' represents current. Current is defined as the flow of electric charge in a circuit and is measured in amperes (A). This flow can be caused by a difference in voltage, which drives the electrons through a conductive medium.

Current is a fundamental concept in electrical circuits, as it tells us how much electricity is flowing at any given time. It's essential in analyzing and designing circuits, as understanding current allows engineers and technicians to ensure that circuits function correctly and safety standards are upheld.

The other options pertain to different electrical concepts: voltage represents the electrical potential difference between two points, resistance quantifies how much a material opposes the flow of current, and power measures the rate at which electrical energy is transferred. Each concept plays a significant role in electrical engineering, but 'I' specifically denotes current.