Answer: When storm clouds produce lightning and thunder, electric potential energy changes to light energy and sound energy.
Explanation:
A lightning occurs within cloud, between two clouds or cloud and ground whenever electric potential difference is created. Electric discharge occurs between the two electrically charged regions. The electric potential energy converts into light energy and sound energy. Lightning is oftenly accompanied by sound. Since the speed of light is much greater than speed of sound, we hear sound of lightning after seeing it.