Combining the relationships of current to voltage and current to resistance gives:

1. Two separate proportionalities combine into one relationship. 2. Current is related to voltage, and current is related to resistance. 3. Combining those relationships gives a single equation. 4. That relationship is also called Ohm's law. _Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 20 'Electric Current, Resistance, and Ohm's Law', sections 20.1-20.7_