One Ohm of resistance lets one Amp of current flow when the pressure is one volt. Two volts would give you two amps of current, Six volts would give you 6 amps, etc. You can calculate the amount of Ohms, Volts or Amps with the following equation. From this equation we can calculate any of the three variables if we know any two. Obviously, the power of a stream of water can be increase by adding a nozzle.
Power comes from the volume and speed of the water jet.
Volts times Amps give Watts. As an example of why this is important, try to follow the following example. Watts Each of the lights below are 12 watts. As such they should give about the same amount of light. What we want to know is how many Amps are used under various voltage situations.