For Further Explanation of Current and Voltage

http://www.youtube.com/watch?v=1xPjES-sHwg#t=300

Voltage and electric current are the two main components that describe electricity. Nilsson & Riedel's textbook, Electric Circuits, describes voltage and electric current respectively as "whenever positive and negative charges are separated, energy is expended.  Voltage is the energy per unit charge created by the separation...The electrical effects caused by charges in motion depends on the rate of charge flow.  The rate of charge flow is known as the electric current."

Voltage is defined as V=dw/dp, where
V=the voltage in volts
w=the energy in joules
q=the charge in coulombs

Electric current is defined as I=dq/dt, where
I=the current in amperes
q=the charge in coulombs
t=time in seconds

Much like the basics of mechanical energy (kinetic and potential energy), electricity is comprised of both the motion of electrons (electric current) and the potential to due work (voltage).
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