Electrolytic capacitors

Construction of both :



Regards, Dana.

Are these electrodes are aluminum ?

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Respectfully, Google took 0.52s to find the Wikipedia page that explains this in details.

It look like both are electrolytic capacitors. The ceramic capacitors available in two classes, class 1 and class 2.

I read that

"The Class 1 ceramic capacitors are used where high stability and low losses are required. They are very accurate and the capacitance value is stable in regard to applied voltage, temperature and frequency. Tolerances of the nominal capacitance value can be as low as 1%.

Class 2 capacitors have a high capacitance per volume and are used for less sensitive applications. Their thermal stability is typically ±15% in the operating temperature range, and the nominal value tolerances are around 20%."

I guess Class 2 is more common than Class 1 in PCB assemblies, right ?
The tolerance X7R and X5R belong to only Class 2, right ?
Class 1 are expansive then Class 2 or not ?

The Class 2 have high capacitance per volume, does that means that Class 1 will be bigger in size to get the same capacitance ?