Maybe this is the most fundamental question, but still it eludes me.
Is it possible for two balls each containing 1 Coulomb of charge be at different voltage levels, say 1V and 2V relative to a common ground?
Mechanics as Electronics
Charge's mechanical equivalent is Mass
Voltage's mechanical equivalent is Potential energy
Current's mechanical equivalent is Fall (useful work can be done when a mass falls and also current flows)
In mechanics: For two bodies with same mass to be at different potential energy, all we have to do is vary the height from the ground.
So, what could be the Electrical equivalent of 'Height'?