Voltage is equal to the pressure in the pipe, the force that is behind the water flow.
The
Amperage, the current, is the amount of water flowing through it per unit of time.
Wattage is simply the above two combined to give you the power, Power = Voltage x Amperage.
Ohms, the resistance, could be thought of as a narrow section of pipe making it harder for the flow to pass through.
Energy is simply the Power, per unit of time. Energy = Power x Time.
