A circuit diagram shows how the components are connected. The following symbols show the different components that can be found in an electrical circuit. Diodes close diodeAn electrical device ...

We can see how circuits work, and represent them with some simple diagrams, using basic electrical components like these. You start with a cell, or combination of cells. These could be batteries ...

The blocks can be joined together to form circuits, with magnets in the blocks mating with screws in the motherboard to hold everything together and make electrical contact between the parts.