In most houses, the wiring is a combination of both parallel and series circuits. Some of the light switches are wired in series, while the outlets are wired in parallel. The main difference between a series and parallel circuit is the way in which the components are connected. In a series circuit, the components are connected in a single loop, so that the current must pass through each component in order to complete the circuit. In a parallel circuit, the components are connected in multiple loops, so that the current can flow through any of the components without having to pass through the others.

In a house, the light switches are wired in series so that when one switch is turned off, all of the lights on that circuit will turn off. This is because the current must pass through the switch in order to reach the lights, and if the switch is off, the circuit is broken and the current cannot flow. The outlets are wired in parallel so that each outlet can be used independently of the others. This is because the current can flow through any of the outlets without having to pass through the others.