Why Does the Electron Stay at the Same Speed in a Series Circuit?

[DrnBrn]

Hello everyone

I have question on very basic physics:

I'm thinking about simple analogies to explain current flowing in a simple series circuit. One analogy I have looked at has a bread factory making bread and loading it onto a truck. Each time a truck passes the bread factory it takes bread, when it passes the supermarket it unloads the bread and continues around the circuit at the same speed.

So, I understand the bread factory is a battery, it transfers energy to the electrons in the circuit, the electrons move carrying the energy, when the electron reaches a bulb it transfers energy to the bulb. And then the electron continues around the circuit back to the battery at the speed it left.

What I don't understand is this:

When I add an extra battery the electron carries more energy, the current increases, the electron or bread truck is moving faster now. So, the current in the circuit increases if I add an extra battery, after the electron reaches the bulb some of its energy is transferred to the bulb. Why then does the electron keep moving at the same speed all the way round? When it gains energy from the extra battery it speeds, it carries more energy, but when it loses energy to the bulb it stays the same speed?

I appreciate your help with this.

Thanks

Darren

 

[Stonebridge]

The analogy of adding the extra battery would be that the bread trucks carry more bread each. They have more bread (energy) to unload at the other end. (The bulb is brighter).
Analogies can often help a lot with understanding, but you have to be careful not to push them too far.