1. Electricity? Electric is light. It takes 1 battery, 2 wires ,1 light bulb to light up you  can put 2 wires, 2 batteries and 1 light bulb.

2. Circuits?  Circuits are something like a circle.
A circuit is always closed. Unless it is a open circuit. It does not make a full circle.

3.  Open circuits?  Open circuits do
not make a full circle. They are always open.
The wires  and what ever you use  will not touch.
That is an open circuit.