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.PEG = mgh |
|Electric potential energy equals to the electric potential energy divided by charge. PE = qEd (see right) |
|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.|