What formula relates current, voltage, and resistance?

The formula that correctly relates current, voltage, and resistance is expressed as I = V/R. This formula is derived from Ohm's Law, which states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor.

When using this formula, you can determine the amount of current flowing in a circuit if you know the voltage and the resistance. Specifically, if you increase the voltage while keeping resistance constant, the current will increase. Conversely, if resistance increases while keeping voltage constant, the current will decrease. This relationship is fundamental in understanding how electrical circuits operate and is essential for solving various problems related to electrical engineering and physics.

The other provided formulas either misrepresent the relationships or do not adhere to Ohm's Law. For example, I = R/V and V = I/R incorrectly position the variables and lead to confusion regarding their relationships. V = IR rearranges Ohm's Law but does not represent the explicit form of current in terms of voltage and resistance. Thus, the understanding of current as a function of voltage and resistance is clearly defined in I = V/R.