Divided voltage is calculated using Ohm's Law, which states that voltage (E) equals current (I) multiplied by resistance (R). The relationship can be rearranged to find the voltage across a specific resistance in a circuit when you know the current flowing through it and the resistance value.
In more detail, if you have a circuit with a known current flowing through a resistor, you can calculate the voltage drop across that resistor by multiplying the current (I) by the resistance (R). This principle is fundamental in electrical circuits to understand how voltage is distributed among different components.
The other options do not align with the established formulas in electrical theory. For example, simply adding current and resistance does not yield a voltage value, and multiplying voltage by resistance does not reflect how voltage is derived from current and resistance in a circuit context. This is why understanding the multiplication of current by resistance clearly outlines how to determine the voltage drop across a resistor in a given circuit.