I've got a simple yet confusing question about how 12v DC current works, specifically with bus bars. I have a setup involving a single 12v battery connected to a fuse box with 12 slots. There are three sets of positive and negative wires connected to three different appliances that draw different current when operating. If I switch to a setup where instead of a fuse box, I simply splice the wires at three points for the appliances to tap into, will that work? I think this setup won't function correctly because different resistances in the appliances will cause current to take the path of least resistance, ignoring the other two connections. So, how does using a bus bar help with this situation, since it seems like the current would still favor the path of least resistance? I feel like I'm missing something crucial here.
3 Answers
You're spot on with your understanding that parallel circuits behave differently. When you splice wires for your appliances, each one does create a parallel circuit. So, current does flow through all available paths, with more current going down the less resistive paths. This setup usually provides enough power for each appliance as long as your power supply is sufficient and the resistance allows current to pass through. It's all about ensuring that your wiring can handle the load!
Great question! You're right to think that splicing the wires might not be the best idea since it essentially creates parallel circuits. But here's the thing: while electricity will always favor the path of least resistance, it still flows through all paths. In a bus bar system, the low resistance means that when appliances draw power, they can all get what they need without significant voltage drops, even if some paths are less resistive than others. This way, each appliance can operate effectively, regardless of its power needs.
It's great that you’re digging into this! The bus bar helps organize your connections neatly. Even if each device pulls different amounts of power, the bus bar distributes it evenly without chaos. Think of it as a highway where all cars (current) can travel. Each vehicle may go at a different speed (current draw), but the highway can handle the total traffic without a hitch. Just make sure your battery and wiring can support the total demand!