What does the letter R represent?

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Multiple Choice

What does the letter R represent?

R represents resistance in electrical circuits. Resistance is the property that limits how much current flows when a voltage is applied, and its standard unit is the ohm (symbol Ω). In Ohm’s law, V = IR, voltage equals current times resistance, which is why the letter R is used specifically for resistance. The other quantities—voltage, current, and power—are denoted by different symbols (V, I, P), not R, so R singles out the resistance aspect.

R represents resistance in electrical circuits. Resistance is the property that limits how much current flows when a voltage is applied, and its standard unit is the ohm (symbol Ω). In Ohm’s law, V = IR, voltage equals current times resistance, which is why the letter R is used specifically for resistance. The other quantities—voltage, current, and power—are denoted by different symbols (V, I, P), not R, so R singles out the resistance aspect.

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