Kirchhoff's voltage law

Kirchhoff's voltage law says that the total amount of electric energy (voltage) in a loop of wires and components adds up to zero. Think of it like playing with toy cars on a track. When you start at one point and drive the cars around the track, the total distance the cars travel must be the same as the distance they have to come back to the starting point.

In the same way, when electricity flows through a loop of wires and components, the total voltage added up as you go around the loop has to be the same as the total voltage that gets subtracted as you come back to the starting point. Imagine a loop with a battery and some resistors in it. The battery gives a certain amount of voltage to start the electricity flowing, and the resistors use up some of that voltage as the electricity passes through them. When the electricity gets back to the battery, there should be no more voltage left over. It's like if you have a cookie and you give pieces of it to your friends. When your friends give you back the pieces of the cookie they didn't eat, you should have exactly the same amount of cookie as before you gave it out.

Kirchhoff's voltage law helps electrical engineers calculate the voltages in circuits and make sure everything is working properly.