The voltage across a resistor is proportional to its what?

The voltage across a resistor is proportional to its what?

• A. Current
• B. Voltage
• C. Resistance
• D. Power

Answer: (C)

Ohm’s law shows how a resistor behaves: V = I × R. This means the voltage across a resistor is directly proportional to the current flowing through it, with the resistance acting as the proportionality constant. If the current stays the same, increasing the resistance raises the voltage in proportion to that change. In the usual circuit sense, the key takeaway is that voltage scales with current through the resistor, not with resistance alone. For a fixed current, voltage is proportional to resistance; for a fixed resistance, voltage is proportional to current. A quick check: doubling the current through the same resistor doubles the voltage.

Ohm’s law shows how a resistor behaves: V = I × R. This means the voltage across a resistor is directly proportional to the current flowing through it, with the resistance acting as the proportionality constant. If the current stays the same, increasing the resistance raises the voltage in proportion to that change. In the usual circuit sense, the key takeaway is that voltage scales with current through the resistor, not with resistance alone. For a fixed current, voltage is proportional to resistance; for a fixed resistance, voltage is proportional to current. A quick check: doubling the current through the same resistor doubles the voltage.