Which formula is used to calculate voltage drop for a single-phase circuit?

The formula used to calculate voltage drop for a single-phase circuit takes into account the direct current (DC) resistance, the current flowing through the circuit (I), and the length of the circuit (L). Option B accurately represents this relationship by factoring in the DC resistance multiplied by the current and the length of the circuit.

In this context, the calculation is essential for ensuring that the voltage drop remains within acceptable limits, allowing the devices powered by the circuit to operate efficiently. The formula includes the division by 1000, which is a standard adjustment to convert the result into a compatible voltage drop value based on the length of the circuit being measured in feet or meters.

The other options fail to encompass the complete parameters necessary for accurately determining the voltage drop in a single-phase circuit. Some may not account for resistance correctly or do not use the standard conversion factor, leading to incorrect calculations.