Why internal resistance decreases with increase in temperature?
Answers
internal resistance decreases with increase in temperature because, the kinetic energy and mobility (movement) of the particles is increased.
# consider a conducting material. It is made up of atoms.
# electricity is conducted due to the movement of electrons from one end to the other.
# resistance is the ability of the material to stop the movement of electrons and thereby, restricting the flow of electricity.
# when temperature is increased, heat energy is transformed into kinetic energy which increase the movement of the electrons.
# thus the mobility is increased. As the mobility is increased, current flowing through the conductor increases.
# from ohm's law, for constant voltage applied, product of current and resistance remains constant.
V = I*R
So, if current increases, resistance decreases. Since current and resistance are inversely proportional to eachother under constant voltage.
Thus, internal resistance decreases with increase in temperature