Finding the Energy Stored in a Capacitor

In this video, we learn how to find the energy stored in a capacitor, and we derive three expressions in terms of the total stored charge, the capacitance, and the voltage across the capacitor.
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This is part of my series on introductory electromagnetism, where we explore one of the fundamental forces of nature - how your phone charges and communicates with the rest of the world, why you should be afraid of the sun, and the fundamentals of electric and magnetic forces and fields, voltages,

[@amenehmayedzadeh3220]

Hi, I hope you're doing well! I'm really confused. How we can add positive charges since electrons are negative and protons don't move??

[@pratyushmundra861]

You're right, and the red positive charge that he drew doesn't represent protons at all. Only electrons are added on the bottom plate - that's the movement when the capacitor is being charged. Now because electrons from the top plate are being pulled from top plate to the bottom, it's as if the electron deficiency creates an increasing "positive" charge.

[@chienbin4813]

thanks