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 the voltage (E) across a conductor is equal to the current (I) flowing through it multiplied by the resistance (R) of the conductor. This relationship can be expressed mathematically as:

[ E = I \times R ]

To isolate resistance (R), you can rearrange the equation by dividing both sides by the current (I). This gives:

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

This formula indicates that resistance is equal to the voltage across a component divided by the current flowing through it. It highlights how voltage and current interact in a circuit to define resistance. Understanding this fundamental relationship is essential for analyzing and designing electrical circuits.