Definitions:
term
unit
common
letter
symbol
defined
notes
Voltage
Volt
V
amount of push of charges
Specifically it equals energy (Joules)
divided by some "test" charge (Coulombs)...1Volt=1Joule/Coulomb
voltage is often referred to as "potential difference"
Current
Ampere
I
number of charges per second.
reminds me of speed, like miles/hour.  1amp=1Coulomb/second
Resistance
Ohm(W)
R
 amount of push (volts) / amount of actual current flow (amps)
how much something
reduces flow of current
amps=volts/ohms, volts=amps*ohms, ohms=volts/amp

Remember the watt?  We know that electrical devices have wattage, so there must be a way to express the watts of an appliance...
amps*volts = Coulomb/sec * Joule/Coulomb = Joule/sec = watts = Power

Put another way, amps*volts=power, and since amps=volts/ohms, then Power= volts2/ohms, and we could also substitute I*R for V, yielding Power=I2/R.