Which combination achieves an EOLR value of 2000 ohms?

The correct answer, which is two 1000 ohm resistors in series, achieves an equivalent load resistance (EOLR) value of 2000 ohms due to the way resistors add together in a series configuration. When resistors are connected in series, their resistances simply add together.

In this case, you have two resistors, each with a resistance of 1000 ohms. By adding these together, you get:

1000 ohms + 1000 ohms = 2000 ohms.

This sum directly results in the desired EOLR value of 2000 ohms.

For additional clarity, if we consider the other options: one 2000 ohm resistor would also provide the correct resistance but is a single component rather than a combination, thus not demonstrating the series connection aspect of the question. Two 500 ohm resistors in series would yield a total resistance of 1000 ohms, not sufficient for the 2000 ohm requirement. Lastly, four 500 ohm resistors in parallel would result in a much lower overall resistance due to the parallel formula, which would not achieve the required 2000 ohms. The series connection of the two 1000