For an ohmic conductor held at a steady temperature, which quantity stays constant?

1. Ohm's law says that for a resistor at constant temperature one particular ratio does not change. 2. That ratio is the potential difference across the resistor divided by the current through it. 3. The ratio itself is what we call the resistance of the component. 4. The product of voltage and current is the power, which changes as the current changes. _Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 10: Electric circuits_