Schematics use symbols to represent components in the circuit. Conventions are used in a schematic to represent the way electricity flows. The common convention we use is from the positive to the negative terminal. The realistic way electricity flows is from the negative to the positive terminal.
Electronic circuits usually use direct current sources. The load of an electronic circuit may be as simple as a few resistors, capacitors, and a lamp, all connected together to create the flash in a camera. Or an electronic circuit can be complicated, connecting thousands of resistors, capacitors, and transistors. It may be an integrated circuit such as the microprocessor in a computer.
Such abstract concepts can be explained using analogies which use familiar words or ideas to represent the ideas which need to be conveyed. Analogies are selected which students should already be familiar with. However, no single analogy can represent all features of an electrical circuit and there are important differences between the analogies used and circuits. Instead appropriate analogies should be chosen to teach selected concepts and students should be prompted to compare analogies with circuits and identify how they differ.
This open hands-on model building effectively combines theoretical and practical STEM skills. Analogies are ideal in supporting and complementing this practical model making and reinforcing the principles taught.