What is a common example of a series circuit?

• A. A home electrical system with lights wired in parallel
• B. Some Christmas Lights
• C. A car battery in parallel with others
• D. A desk lamp with multiple bulbs in parallel

Answer: (B)

In a series circuit, the current flows through every component in one continuous path, so the same current goes through each device and the total resistance is the sum of all the components. Some Christmas Lights fit this description because the bulbs are placed in a single chain along a string, sharing one path from the power source. That means if one bulb burns out or is removed, the circuit can open and the entire string goes out, which is a classic behavior of a series arrangement.

The other scenarios describe parallel wiring: in a home, lights wired in parallel each have their own path to the supply, so the voltage across each light stays the same and one light failing does not necessarily darken the others. A car battery in parallel with others also shares the load on separate paths, not in a single series chain. A desk lamp with multiple bulbs wired in parallel keeps each bulb at the supply voltage, so all bulbs operate independently.

So the best example of a series circuit among these is some Christmas Lights.