What Limits Exist?

What are the fundamental constraints or boundaries on how electricity flows in circuits? One limit is the resistance in the wires and components. Think of electricity as water flowing through a pipe. If the pipe is narrow or blocked, the water can't flow easily. Resistance works the same way by slowing down the electric flow. Materials like rubber have high resistance and don't let electricity pass easily, whereas metals like copper have low resistance, making them great for wires. Another limit is the power supply. A battery can only push so much electricity through at a time. If you ask a small battery to power something too big, like trying to pull a heavy wagon with a tiny toy car, it just won't work.