Hello. If I have two 30F capsitor rated for 6volts in series with each other will their voltages add up to be able to handle a 12 volts power supply. Thanks.

 

In theory, yes; but in practice it is not good to use components at their rated maximum voltage if you want them to have a long life. Even if they start life closely matched, one cap may age faster than the other and lose capacity. It could then die from over-voltage.

 

Hello,

I would say Yes, but the total capacity will be lower:
https://www.allaboutcircuits.com/textbook/direct-current/chpt-13/series-and-parallel-capacitors/

Keep in mind that capacitors can have a large tollerance.
The voltage will not be equal on both capacitors.

For practical reasons, I always take capacitors that will have a working voltage of at least 1.5 times the voltage used.

Bertus

 

Hello. If I have two 30F capsitor rated for 6volts in series with each other will their voltages add up to be able to handle a 12 volts power supply. Thanks.

Is that 30 Farad, μf, or pf?
Max.

 

Hello. If I have two 30F capsitor rated for 6volts in series with each other will their voltages add up to be able to handle a 12 volts power supply. Thanks.

30 farads??? Check that to be sure.

I would advise against it. First, even if they actually divide the voltage evenly, you are operating them at their max rated voltage. Not a good idea. Second, they will not have exactly the same capacitance, even when new, so you one of them WILL be operating over its rated voltage. Not a good idea. Finally, the actual voltage division between them will be dictated not by their capacitance, but by the difference in their leakage currents, resulting in one of them being operated well above its rated voltage. Not a good idea.