How do you explain a simple circuit?

How do you explain a simple circuit? How to explain simple circuit, simple circuit is easiest electrical loop you can make with battery, wire, and bulb, showing how electricity flows in circle to make something work. Take battery as source of energy like water pump, wire as pipe or road for electricity to travel, bulb as device that uses electricity to light up, switch as gate that opens or closes road. Connect wire from battery positive to bulb, then wire from bulb back to battery negative, and add switch in wire, you have simple circuit. When switch on or closed, loop complete, electricity flows from battery through wire to bulb lighting it, then back to battery, bulb on. When switch off or open, loop broken, electricity cannot flow, bulb off. So simple circuit is battery plus wire plus bulb in loop, demonstrating closed loop needed for current flow, basic building block of all electrical systems, easy to build with flashlight battery, small bulb, and two wires.