Ohm's law and Kirchhoff's law

In class today, we learned about Ohm's law, which states that current and voltage are directly proportional to each other. In other words, when current goes up, voltage goes up, and when current goes down, voltage goes down. Also, Ohm's law states that current and resistance are inversely proportional with each other, in other words, when current goes up, resistance goes down, and when current goes down, resistance goes up.

Gustav Robert Kirchhoff was a scientist in the 17th century whose research lead to his proposal of his laws of current and voltage.

Firstly, Kirchhoff's current law states that the total amount of current into a junction point (a point where two or more things join together) equals the total current that flows out of that same junction.

Secondly, Kirchhoff's voltage law states that the total amount of voltage that decreases in any complete circuit loop always equals the total amount of voltage gained in that circuit loop.

Notice how in the first law, the currents from all four sources going into the junction point (a-d) is equal to the current flowing out to the two sinks (e-f)

In the second law, the voltage source, a, is where the voltage comes from, where the current "recharges" its voltage. This increase is equal to all decreases in voltage throughout the complete circuit (b-f).

Ohm's Law can be demonstrated with the triangle shown below.