What does the formula E/I calculate in a circuit?

The formula E/I calculates resistance in a circuit, where E represents voltage and I represents current. According to Ohm's Law, resistance (R) can be determined by dividing the voltage (E) across a component by the current (I) flowing through it. This relationship is fundamental in electrical engineering and is pivotal in understanding how circuits function.

In this context, voltage is the potential difference that drives current through a circuit, while current is the flow of electric charge. Resistance, measured in ohms, quantifies how much a component opposes the flow of current. Therefore, the calculation of E/I is essential for technicians and engineers when analyzing and designing electrical circuits, ensuring safety and efficiency in fire alarm systems and other electrical applications.