According to Ohm's Law, what is the formula for calculating voltage?

• A. V = I × R
• B. V = P × R
• C. V = I / R
• D. V = R / I

Answer: (A)

Ohm's Law defines the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. The formula V = I × R indicates that voltage is equal to the current flowing through a conductor multiplied by the resistance of that conductor. This relationship is fundamental in understanding how electrical systems operate.

When a current is applied across a resistance, the resulting voltage drop across that resistance can be calculated using this formula. For instance, if you know the amount of current flowing (in amperes) and the resistance present (in ohms), you can easily determine the voltage (in volts). This concept is critical in designing and analyzing electrical circuits, ensuring they function within safe and efficient parameters.

The other options present formulas that do not accurately represent how voltage is calculated according to Ohm's Law. For example, the formula involving power (P) and resistance is not a standard representation of voltage within this context, and the division or alternative formulas do not align with the established relationship defined by Ohm's Law. Understanding this fundamental relationship is key for anyone studying or working with electrical concepts.