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if R4 is the only resistor (the load), then the drop would be the same as the energy source
You'll see a voltage drop across a resistor if current is flowing through it. It only has to be a part of a complete circuit, i.e. one in which current is flowing.
For voltage drop calculation you must use the current of the load and the distance of the load from the supply source. The circuit breaker is then used to limit the current to the rating of the wire that feeds the load.
If a swing has a working load of 300 pounds and the rotation hook has a working load of 1000 pounds, what is the maximum weight of a person that would be allowed on the swing?
A: That will happen anytime the voltage source is not able to provide the power needed for the load. If the load exceed the power available from the source the voltage will be reduced as IR drop from the source