Which formula would you use to calculate the value of a resistor?

The correct formula to calculate the value of a resistor is represented by the equation V = I * R, where V stands for voltage, I represents current, and R is the resistance. This equation is derived from Ohm's Law, which establishes the relationship between voltage, current, and resistance in an electrical circuit.

Using this formula, you can rearrange it to find the resistance by manipulating the equation into R = V / I. This reorganization shows that resistance can be calculated by dividing voltage by current, which is reflected in option D (though the letter assigned might not be accurate). This relationship underscores how when you know the voltage across a resistor and the current flowing through it, you can determine the resistance value directly.

Other choices, such as E = R * I or E = I / R, imply a misunderstanding of Ohm's Law and do not yield the correct or standard formula for determining resistance. E is often mistaken for voltage or energy in different contexts, leading to confusion.