Here's how it works:
* One path: There is only one path for the current to travel from the positive terminal of the power source to the negative terminal.
* Shared current: All components in the series circuit share the same current.
* Voltage drop: Each component in the circuit will have a voltage drop across it, and the sum of all these voltage drops equals the total voltage of the power source.
Think of a string of Christmas lights. If one bulb burns out, the entire string goes dark because the circuit is broken. This is because the current can no longer flow through the broken path.