4.1.1 - The capacitor

The capacitor can be considered as an energy storage device in an electrical circuit. Since such component early beginning, it can be classified into two main categories: the physical- chemical and the electro-mechanical. In the first category there are the leaf and the electrolitic capacitors; while in the second one the variable capacitor.
Several types of capacitors made 1920 to 1945
The pictorial evolution of the variable capacitor:
a- circular plates variable capacitor
b- orthometric variable capacitor
c- circular plate variable capacitor
d- modern type of variable capacitor using several sections