Firefighter Practice Exam

What is the total resistance of four resistors rated at 2 OHMS each when connected in series?

1. 1 OHMS

2. 2 OHMS

3. 3 OHMS

4. 8 OHMS

The correct answer is: 8 OHMS

To determine the total resistance of resistors connected in series, you simply add the resistance values of each individual resistor together. In this scenario, you have four resistors, each rated at 2 ohms. When resistors are in series, the total resistance (R_total) is calculated as follows: R_total = R1 + R2 + R3 + R4 Substituting the values gives us: R_total = 2 ohms + 2 ohms + 2 ohms + 2 ohms = 8 ohms This approach adheres to the principle that in series circuits, the total resistance increases with each additional resistor because the current must pass through each one sequentially, hence the total opposition to the flow of current sums up. Thus, the correct answer is 8 ohms, as it reflects the cumulative effect of the resistors on the circuit's overall resistance.