What is the abbreviation for resistance?

• A. I
• B. R
• C. E
• D. V

Answer: (B)

Resistance is the property that opposes current flow in a circuit. In electronics notation, resistance is abbreviated by the letter R, which appears in Ohm's law as V = I × R. Here I stands for current and V stands for voltage, so R is the quantity that links them. The other letters represent different quantities: I is current, V is voltage, and E is often used for electromotive force or energy rather than resistance. Therefore, the abbreviation for resistance is R.