Which is an example of a parallel circuit?

A parallel circuit is characterized by multiple paths for current to flow. In a parallel setup, if one component fails or is disconnected, the remaining components can still operate because they have separate paths for electrical flow.

In the example where a Christmas tree has two lights out on different strands but the rest of the lights remain lit, this demonstrates the nature of a parallel circuit. The lights are organized so that each strand operates independently. Even if some lights are out, the others continue to function, illustrating that electric current still has multiple pathways to travel through the circuit.

This independent operation is not exhibited in the other scenarios. A lamp that’s not plugged in or a burnt-out brake light represent circuits that are either open or incomplete, thereby preventing current from flowing. The case of a strand of lights that does not light up when one bulb is out indicates a series circuit, where the failure of one component stops the flow of electricity through the entire strand. Thus, the correct answer is the one that exemplifies the defining characteristics of a parallel circuit.