What is the formula to calculate the voltage in a circuit?

The formula to calculate voltage in an electrical circuit is V = I × R, where V represents voltage, I represents current, and R represents resistance. This equation is derived from Ohm's Law, which is fundamental in electrical engineering and physics. According to this law, the voltage across a conductor (or load) is proportional to the current flowing through it and the resistance of the conductor.

In practical terms, this means that if you know the current flowing through a circuit and the resistance the current encounters, you can easily calculate the voltage. For example, in a simple circuit with a resistor, if the current is measured to be 2 amperes and the resistance is 5 ohms, applying the formula yields a voltage of 10 volts (V = I × R = 2 A × 5 Ω = 10 V).

This relationship is crucial for understanding how electrical components interact in a circuit, ensuring that devices are supplied with the correct voltage for safe and efficient operation.