In a circuit with 5V DC battery and a light bulb of certain resistance, electrons enter through one terminal and come out of the other. And its evident that the current is same throughout the circuit.
My question is,
What is the **Difference** between the electron that entered the bulb and the electron that come out, there must be some because the electrons are responsible for the bulb's glow. And also the reason can't be Kinetic Energy because if electrons have a loss of speed in the bulb then **dq/dt** or current entering or leaving must be different.