How can voltage be calculated in an electrical circuit?

Voltage in an electrical circuit can be calculated using the formula ( V = I \times R ), where ( V ) is the voltage, ( I ) is the current, and ( R ) is the resistance. This relationship is rooted in Ohm's Law, which establishes that the voltage across a conductor is directly proportional to the current flowing through it, given a constant resistance. This formula is fundamental in electrical theory, allowing users to determine how much voltage will be needed to push a certain amount of current through a specific resistance.

By multiplying the current (measured in amperes) by the resistance (measured in ohms), you derive the voltage (measured in volts). This principle can be applied in various scenarios, such as calculating the required voltage for circuits or understanding how components behave under different conditions.

The other choices do not accurately represent the method to calculate voltage. The formula combinations provided in those options would not yield the correct calculation for voltage in a standard electrical circuit context.