In work, we often encounter the problems of voltage loop and current loop. Generally, in high and low voltage distribution cabinets, the current loop and voltage loop are separated. So what are the differences between voltage loop and current loop?
The current loop is: current flows out from the positive pole of the power supply, passes through the electrical appliance, does work on the electrical appliance, and then flows back into the negative pole of the power supply, thus forming a loop.
When electrical appliances are connected in series, it is equivalent to resistors in series. The sum of voltage drops across all appliances is of course equal to the power supply voltage, which is the loop voltage law. The voltmeter is connected in parallel to the power supply, and the measured voltage is the power supply voltage, which also satisfies the loop voltage law.
The current loop is: the loop formed by current flowing from one end of the power supply through the load back to the other end of the power supply. The entire current loop should include the current inside the power supply, and it is a closed loop. Current is generated by the directional movement of charges, and it can only be produced when a closed loop is formed.
In actual work, the voltage loop and current loop are generally independent and separate, not subordinate to each other. In work, we must carefully distinguish them.
