The resistance to thévenin equivalent RTh is the resistance measured "looking back" into the circuit across locations A and B. After all sources of voltage and current have been replaced with their internal resistances, the resistance is measured.
Instead of replacing a current source with an open circuit, we simply reduce the current coming from the source to zero. When we reduce an ideal current source's current to zero, we are left with an infinite internal impedance, which is an open circuit.
When you are ready to attach the load device (often a basic electronic component), the circuit in the related laboratory experiment will include two sockets or two crocodile clips at these points. our goal, however, seems to begin by thinking about the circuit before anything is linked between those two places. It actually refers to the voltage between the two places when there is no load.
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