Gravitational Potential vs. Electric Potential
Any matter lifted from the surface of the earth has a potential energy. Thisis given by the formula PE=mgh, and the potential energy can be altered by changing its height. The also can be changed by changing distance between two charges. 
Gravitational potential energy equals to product of the mass of an object, gravitational field force, and its height from the earth.PE_{G} = mgh where:

Electric potential energy equals to the electric potential energy divided by charge. PE = qEd (see right) where:

Electric potential is called voltage, which can be derived from above equation. Voltage is also related to force. V = Ed = (F/q)*d = Fd/q= W/q (W = Fd  force times displacement in the direction of force is work (J)) A high voltage means that each individual charge is experiencing a large force. A low voltage means that each individual charge is experiencing a small force. 
"q" on A has smaller force than "q" on B. If the distance of B is one half of that of A, the force acting on B is twice as large as A because the force is inversely proportional to the square of the distance between two charges. 