What is the name of the formula E = I x R?

The formula E = I x R is known as Ohm's Law, which describes the relationship between voltage (E), current (I), and resistance (R) in an electrical circuit. According to this law, the voltage across a conductor between two points is directly proportional to the current flowing through it, with the resistance being the proportionality constant.

Ohm's Law is fundamental in electrical engineering and automotive diagnostics, as it allows for the calculation of one variable (voltage, current, or resistance) when the other two are known. This relationship is crucial when diagnosing electrical issues in vehicles, as understanding how voltage, current, and resistance interact provides insight into how circuits are functioning or failing.