Where and how are the Kirchhoff's laws actually used? Are there any problems that can only be solved with the laws? Consider the resistor cube.

The **resistor cube** consists of twelve equal resistors **R**.
The resistors are soldered in a cube,
so that each side of the cube has the resistance **R**
(in this experiment **R = 1 kΩ**).

How large is the **resistance**
between the nodes of a **space diagonal**
(for example **A** and
**B**)?

The **resistor cube** can also be realized on
your **breadboard**...

With a multimeter you measure the resistance
**R _{total}** between

R_{total}
= ^{5}/_{6} R
= 833 Ω

However, can you also **calculate** the resistance
**R _{total}**?
For this you use