What Is Electric Current & Voltage

We realize that a molecule comprises electron, protons, and neutrons. Every electron has a negative charge and every proton has a positive charge. a neutron conveys no charge and is in this manner nonpartisan. In a particle, the quantity of electrons is equivalent to the number of protons and the molecule is electrically unbiased. electrons might be added to or detracted from a molecule. this bothers the electrical adjust of the particle. In the event that an iota loses an electron, it is left with a general positive charge, since it has a proton in an overabundance of those expected to adjust the impact of its electrons. such a charged molecule is known as a positive particle. On the off chance that an electron is added to a molecule, it achieves a negative charge. Such a charged particle is known as a negative particle. A body having various ionized iotas is said to be electrically charged.

What Is Voltage

Energy is required for the movement of charge from one point to another. Let W joules of energy be required to move a positive charge of Q coulombs from a point a to point b in a circuit. We say that a voltage exists between the two points. The voltage V between two points may be defined in terms of energy that would be required if a charge were transferred from one point to the other. Thus, there can be a voltage between two points even if no charge is actually moving from one to the other.
the voltage between a and b is given by 
    V=W/Q J/C

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