Which letter(s) represent resistance in an electrical circuit?

In an electrical circuit, resistance is represented by the letter 'R'. This is a standard notation in electrical engineering and physics. Resistance is a measure of the opposition to the flow of electric current through a conductor. The unit of resistance is the ohm, symbolized by the Greek letter omega (Ω). Understanding this concept is crucial for analyzing circuits, as it affects how much current can flow for a given voltage according to Ohm's Law, which states that voltage (E) equals current (I) multiplied by resistance (R). Therefore, recognizing 'R' as the symbol for resistance is essential for anyone studying electrical systems and their components.