A: There is only one source thermal
A resistance that doesn't change.
It isn't. If you're using superposition, you open circuit current sources and short voltage sources; this is because the current source declares the current that will be flowing through that branch. Both current and voltage sources have a finite internal resistance.
Changing the potential difference in a circuit does not change the resistance. Rather, it changes the current.
Change its temperature.
yes, calculate it from temperature coefficient of resistance.
Inertia is the resistance of a object to change in its motion
Inertia is the resistance of a object to change in its motion
You can change the resistance manually however there is no way to change the rate automatically.
Change the resistance in the circuit
inertia
Inertia
5 ohms