Krichhoff's voltage law (kvl) is said to be conservation of energy but i couldn't get a satisfactory explanation for that, hence i tried of thinking one but i doubt its validity, my instructors at collage thought of it as something useless , i couldn't understand them !! I think somebody here can help me this is what i want to say - say, we have a simple circuit consisting of a battery(of emf E) and a resistor(of resistance R), so having connected them by ideal wires, we have electrons in the wire which sense the potential difference of the battery, and hence get some sort of energy then they move in the wire till they encounter the resistor,and then as krichhoff's law says the formerly energized electrons experience equal and -ve potential drop due to resistor so that net potential drop/ gain in the loop is zero. so i think this can be interpreted as - the resistor consumes all of the energy of the electrons provided to them by the battery and converts that to heat !!!! but the pitfall here in this logic is what happens to those electrons then , after they leave the resistor ?? i couldn't think of that so is it correct or no ?? i would like to have the answer on microscopic understanding , a classical point of view. i don't understand quantum mechanics But please keep the explanation simple i am in high school !!!