Electricity, Importance of Electricity, Electric Current, and Resistance
Electricity is a form of energy resulting from the existence of charged particles known as electrons or protons, either statically as an accumulation of charge or dynamically as a current.
Electricity is important because it allows us to use machines and electronic devices.  The entire world runs on electricity and energy, making it a crucial factor in the making the world go round.
Electric current is the rate of charge flow.  It is measured in Coulombs/second also known as Amperes. In most currents, the resistance to current flow is constant, therefore the current in the circuit is related to voltage and resistance.

Capacitance
Capacitance is a property of a circuit element that permits it to store charge.  If electric charge is transferred between two initially uncharged conductors, both become equally charged.  The capacitance is the ratio of the amount of charge on either conductor to the potential difference between the conductors.  This is represented by the function: C = q/V.   The unit of capacitance is named the farad (symbolized F).  This is equal to one coulomb per volt. One farad is a relatively large capacitance.  Common examples of capacitance include: the human body, batteries, cell phones, laptops, cars, etc.