Which letter is the commonly used symbol for electrical resistance?

Which letter is the commonly used symbol for electrical resistance?

• A. V
• B. P
• C. R
• D. I

Answer: (C)

In circuit notation, resistance is represented by the letter R. This distinguishes it from voltage (V) and current (I) and from power (P). Ohm’s law shows how they relate: V = I R, so resistance is the ratio of voltage to current, with units of ohms (Ω). When you see R in calculations, you’re dealing with how much a component resists the flow of current. The other symbols don’t denote resistance: V stands for voltage, I for current, and P for power.

In circuit notation, resistance is represented by the letter R. This distinguishes it from voltage (V) and current (I) and from power (P). Ohm’s law shows how they relate: V = I R, so resistance is the ratio of voltage to current, with units of ohms (Ω). When you see R in calculations, you’re dealing with how much a component resists the flow of current. The other symbols don’t denote resistance: V stands for voltage, I for current, and P for power.