How to calculate the value of potential energy? provide one example and explain.

You can speack about potential energy (Ep) when you have tow masses, for example the mass of Earth and a bowling ball. lets note the masses :Earth has mass noted with "M"and the mass of the ball is note with "m". If the distance between ball and Earth is d = 10 meters, we can say that the ball is in the potential field of Earth because the tow objects interact eachother with gravitationa forces. So at d = 10 meters we can dfine the potential in that point and we called the potential energy (Ep) and the formula of it is Ep = mgd ... m and d we already define and g= grvitational accleration. I choose thise example and explain it that way because is a easy one and M >> m.

Wind or electric energy force force of friction

It may possibly be c i think |-/