1. Total power = power of each capacitor in series, i.e. QT = Q1 = Q2 = Q3....
2. Total voltage = sum of voltages of capacitors in series, i.e. E = V1 + V2 + V3....
3. The reciprocal of the total capacitance = the sum of the reciprocals of the capacitances in series, i.e. 1 / CT = 1 / C1 + 1 / C2 + ………
4. Total energy = the sum of the energy of each series capacitor, that is, WT = W1 + W2 + W3....

Withstand voltage calculation formula:

Total voltage: U
U1=C2*U/(C1+C2)
U2=C1*U/(C1+C2)
Example: C1 is 10UF and C2 is 22UF. The voltage across C1 is 15.62V and the voltage across C2 is 34.74V.When capacitors are connected in series, the voltage and capacitance are inversely proportional.

However, in actual operation, if one of the capacitors breaks down due to various reasons, the total voltage will be added to the other capacitor, which is not very reliable. Therefore, we should be cautious when connecting high-voltage capacitors in series.

For circuits with higher voltages, the series connection of capacitors will not be an ideal "automatic" distribution of the withstand voltage, and voltage-dividing resistors of hundreds of KΩ or MΩ or more must be connected separately.