NICET Level 2 Fire Alarm Systems Practice Exam 2026 - Free Fire Alarm Systems Practice Questions and Study Guide

To determine the minimum resistance value in a circuit, you can use Ohm's Law, which states that Voltage (V) = Current (I) x Resistance (R). In this scenario, the total voltage is given as 12VDC, and the current drawn is 1 ampere.

By rearranging the formula to solve for resistance, we have:

R = V / I

Substituting the provided values:

R = 12V / 1A = 12 Ohms

This shows that a current of 1 amp flowing across a potential difference of 12 volts will require a resistance of at least 12 ohms to maintain this current flow. It's important to ensure the resistance is appropriate for the system's design and operational safety, particularly in fire alarm systems where reliable operation is critical.

Thus, the minimum resistance value of 12 ohms calculated from the given voltage and current is accurate, confirming that this is indeed the correct choice.