Objective
We investigate how a diode and a bridge rectifier converts the alternating voltage to a direct voltage.
We also see how a capacitor can be used to smoot the pulsating direct current.
The rectifier circuit constitutes a very simple “power supply”. In this lab exercise we will use a resistor as “a device to
be powered”.

Principle
Normally, the rectifier circuit is placed after a transformer that converts the AC mains voltage from the wall socket to
a lower voltage.
But in order to be able to follow the variations in voltage and current, we don’t use 50 Hz (or 60 Hz) AC voltage here
but instead a function generator adjusted to e.g. 0.1 Hz
With such a “slow motion” AC voltage, the variations can be observed with analog (needle) meters.