volts. amps. ohms

During our last session, we explored the water-flow/electric-current-flow analogy and summed it up in a few sentences that are worth repeating:   •  Water:  The pressure created by the pump forces water to flow through the pipes and valves, overcoming the friction losses of the system.  Higher pressure provides for more gallons per minute. •  Electricity:  The voltage created by the battery forces electrons to flow through the wires and switches, overcoming the ohmic resistance of the circuit.  Higher voltage provides for more amperes.  (The short version of that is, "Volts push amps through ohms.") To be truly useful to us, we must know something about the way these three basic units relate to