Stage 3: Circuits

A circuit is simply a complete loop that electricity can flow through. In this stage you will break that loop down into its essential parts — source, conductor, load, and return path — and then explore the two fundamental ways to connect components: series and parallel.

You will discover why old-fashioned Christmas lights all went dark when one bulb burned out (series), why flipping off your kitchen light does not kill the TV (parallel), and how real devices mix both approaches. We also cover what happens when things go wrong: open circuits that silently stop working and short circuits that can be genuinely dangerous.

The stage wraps up with grounding — the safety system behind the third prong on every power plug. By the end you will be able to identify circuit types, predict how they behave, and understand the protective features built into modern electrical systems.