Which combination achieves an End Of Line Resistor (EOLR) value of 2000 ohms?

• A. Two 1000 ohm resistors in series
• B. One 2000 ohm resistor
• C. Four 500 ohm resistors in parallel
• D. Three 1000 ohm resistors in series

Answer: (A)

End-of-line resistance is set by combining resistors to reach a specific target value, because the control panel uses that value to supervise the circuit. When resistors are placed in series, their resistances add together. So two 1k-ohm resistors in series give 2k-ohms, which matches the 2000-ohm target for the EOLR. The other options don’t hit 2000 ohms when you calculate them: four 500-ohm resistors in parallel come out to 125 ohms; three 1k-ohm resistors in series total 3000 ohms; a single 2000-ohm resistor would be 2000 ohms but it isn’t a combination of multiple resistors. Therefore, the combination that achieves 2000 ohms from the given choices is two 1000-ohm resistors in series.