Function Generator
The Function Generator is a machine where we can see the wave form of electric current in other words it shows how the electric moves and we use it in the Electronic Labs.
Also you can set the frequency of the wave and the unit of the frequency is in Hertz (Hz) moreover you can set the frequency that you want. Also, you can change the Amplitude of the wave.
There are many shapes for the waves that you can get from the Function Generator, for example Sine, Square, Triangle, and Saw Tooth. If you want to see the waves you should connected to the oscilloscope.
You can see from the picture below the different shapes for the waves generated by the function generator.


References:
www.azarpartoo.com
www.wikimedia.org