Learn how engineers design electrical circuits by calculating the voltage, current and resistance of electrical components.

The most common circuits for current determination are given in Figure 2. A sense resistor is connected in series with the supply line carrying the desired current.

Like many hackers, [Matthias Wandel] has a penchant for measuring the world around him, and quantifying the goings-on in his home is a bit of a hobby. And so when it came time to sense the current … ...