I am not able to understand what a load resistor is and how does it relate with a load.
Can anyone explain how the load resistor works and how is it different from the general resistor.
Electronic – a load resistor
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Best Answer
A load resistor is well... nothing but a resistor : a 2-terminal component that complies with Ohm's law and whose impedance is real (purely resistive, no reactance of admittance whatsoever).
What makes it a load resistor is the fact that it is placed at the output of something. The key here is understanding that, actually, a load resistor (or a resistive load) makes more sense as a modelling/analysis thing than as an actual thing. It's used, for example, to model the current draw you expect when you connect something to (i.e., when you "load") your circuit output.
Actual resistive loads are rarely called "load resistors". The widest used real-world mostly resistive loads are light bulbs, and nobody calls them "load resistors".
The generalization of this concept is the load impedance. A load impedance can be complex (not purely resistive, thus with reactance of admittance), so as to model the transient and/or frequency-dependent behaviour of something you connect to your circuit. Inductive loads are widely used to model motors, for example.