What formula is used to calculate resistance in a circuit?

The formula used to calculate resistance in a circuit is derived from Ohm's Law, which states that voltage (E) is equal to the product of current (I) and resistance (R). Rearranging this fundamental relationship leads to the formula for resistance: Resistance (R) equals voltage (E) divided by current (I). This means that if you know the voltage across a component and the current flowing through it, you can determine the resistance by simply dividing the voltage by the current. This principle is crucial in understanding how electrical components interact in a circuit, as it allows for the analysis and design of complex electrical systems by using a simple mathematical relationship.