What is Coulomb's Law?

Any two charged objects will create a force on each other.   Opposite charges will produce an attractive force while similar charges will produce a repulsive force.  The greater the charges, the greater the force.  The greater the distance between them, the smaller the force. 

Comparing Electrostatic forces to Gravitational forces 

Normal household circuits in the U.S. operate on an AC voltage of about V =120 volts. Connected to such a ciruit, the electric power relationship P = IV tells us that to use power at the rate of P = 120 watts on a 120 volt circuit would require an electric current of I = 1 ampere. One ampere of current transports one Coulomb of charge per second through the conductor. So one Coulomb of charge represents the charge transported through a 120 watt lightbulb in one second.

If two one-second collections of 1 Coulomb each were concentrated at points one meter apart, the force between them could be calculated from Coulomb's Law. For this particular case, that calculation becomes

Example provided by HyperPhysics