The voltage across a resistor is proportional to which property?

The voltage across a resistor is proportional to which property?

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

Answer: (C)

Voltage across a resistor follows Ohm's law: V = I R. This shows the voltage is determined by both how much current flows and how much the resistor resists that current. If you keep the current the same, increasing the resistance raises the voltage in direct proportion. So the property that sets the voltage for a given current is resistance; doubling the resistance doubles the voltage when the current stays unchanged. Temperature doesn’t set this relationship, and while voltage and current are linked, the resistor’s resistance is the factor that scales one to the other.

Voltage across a resistor follows Ohm's law: V = I R. This shows the voltage is determined by both how much current flows and how much the resistor resists that current. If you keep the current the same, increasing the resistance raises the voltage in direct proportion. So the property that sets the voltage for a given current is resistance; doubling the resistance doubles the voltage when the current stays unchanged. Temperature doesn’t set this relationship, and while voltage and current are linked, the resistor’s resistance is the factor that scales one to the other.