People think that electricity is complicated and hard to understand. Imagine a diagram of all pipes supplying water for small city . This diagram could easily be mistaken for the wiring of large building. Understanding electricity is no more complicated than understanding a plumbing system . Electricity is invisible and can be so dangerous enough to cause serious injury . In the first instance , our eyes need the help of meters and test instruments to visualize electricity. Ohm’s law (Resistance = Volts/Amps) and stepping on a garden hose , which restricts the water flow and mechanical friction , are similar to the resistive nature of electrical circuit. The electricity that flows in electric circuit transports the energy.