Which of the following equations can be used to find the current if the voltage and resistance are known?

The equation to find the current when the voltage and resistance are known is derived from Ohm’s Law, which states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R).

The relationship is expressed mathematically as:

[ I = \frac{V}{R} ]

This means that to calculate the current, you take the voltage and divide it by the resistance. This equation helps to understand how changing the voltage or resistance will affect the current in a circuit. If the voltage increases while the resistance remains constant, the current will increase proportionally. Conversely, if the resistance increases while the voltage is kept constant, the current will decrease.

The other equations presented don't reflect the correct relationship between voltage, current, and resistance as outlined in Ohm’s Law. Therefore, the equation I = V/R accurately describes how to calculate current based directly on the known values of voltage and resistance.