How to Connect Capacitors in Parallel

Capacitors in Parallel

Capacitors may be said to be joined “in parallel” if each of their pins are correspondingly linked to each pin of the additional capacitor or capacitors. The voltage ( Vc ) attached throughout each of the capacitors which are linked in parallel may be the IDENTICAL. In that case,Capacitors in Parallel possess a “common voltage” supply throughout all of them presenting:

VC1 = VC2 = VC3 = VAB = 12V

In the below given circuit the capacitors, C1, C2 and C3 are all connected with each other within a parallel arm among points A and B as demonstrated.

capacitors in parallel

While capacitors are connected with each other in parallel the sum or comparable capacitance,CT in the circuit add up to the sum of each of the specific capacitors added collectively. The reason being the top plate of capacitor, C1 is coupled to the upper plate of C2 that is attached to the upper plate of C3 and so forth.

The exact same can also be witnessed for the capacitors lower plates. Then it may be considered as if the 3 pieces of plates were being in contact one another and add up to one substantial single plate thus boosting the effective plate area in m2.


Considering that capacitance, C relates to plate area ( C = ε A/d ) the capacitance associated with the pairing will likely increase. Then your total capacitance magnitude of the capacitors attached with each other in parallel could be determined by adding the plate area collectively. Quite simply, the whole capacitance can be comparable to the sum of each of the specific capacitance’s joined parallel. You could have realized that the overall capacitance of parallel capacitors can be found in the same exact way as the entire resistance of series resistors.

The currents (amps) streaming via each capacitor and as all of us observed in the earlier article are relevant to the voltage. In that case by making use of Kirchoff’s Current Law, ( KCL ) to the previously mentioned circuit, we now have

Total Circuit Current

and this may be differently written as:

total circuit capacitance

Then we may state the total or comparable circuit of capacitance, CT to be the sum of each and every individual capacitance’s put together providing us with the more typical expression of

Parallel Capacitors Equation

capacitors in parallel equation

While adding mutually joined capacitors in parallel, they will need to all be transformed to the similar capacitance units, may it be uF, nF or pF. Furthermore, we are able to observe that the current running through the overall capacitance value, CT is not different from the full circuit current, iT

We are able to additionally outline the total capacitance of the parallel circuit from the total accumulated coulomb charge employing the Q = CV equation for charge on a capacitors plates. The whole charge QT accumulated on all the plates is the same as the sum of the specific accumulated charges on each one capacitor hence,

Equivalent Capacitance in Parallel

As the voltage, (V) is shared for parallel connected capacitors, you can divide each side of the above formula via by the voltage going out of the capacitance and just by adding with each other the value of the specific capacitances gives you the entire capacitance, CT. Additionally, this equation is not based on the quantity of Capacitors in Parallel in the section, which enables you to therefore be generic for almost any quantity of N parallel capacitors plugged in with each other.

Capacitors in Parallel Example No1

As a result by using the values of the 3 capacitors from the above illustration, we are able to estimate the overall comparative circuit capacitance CT to be:

CT = C1 + C2 + C3 = 0.1uF + 0.2uF + 0.3uF = 0.6uF

capacitors connected in parallel

One crucial point to consider regarding parallel connected capacitor circuits, the overall capacitance (CT) of any 2 or more capacitors joined with each other in parallel ends up being Higher than the value of the biggest capacitor in the group as we have been adding together values. Therefore in our illustration above CT = 0.6uF while the biggest value capacitor is barely 0.3uF.

While 4, 5, 6 or higher capacitors are attached with each other the overall capacitance of the circuit CT would yet be the total of all the specific capacitors put jointly and as we understand now, the overall capacitance of a parallel circuit is invariably no less than the maximum value capacitor.

It is because we have successfully raised the overall surface area of the plates. In case we achieve this with a couple of matching capacitors, we have now made twice the surface area of the plates which inturn raises the capacitance of the conjunction and so on.

Capacitors in Parallel Example No2.

Calculate the overall capacitance in micro-Farads (uF) of the following capacitors when they are coupled with each other in a parallel combination:

  • a)  2 capacitors each having a capacitance of 47nF
  • b)  1 capacitor of 470nF joined in parallel to a capacitor of 1uF

a) Total Capacitance,

CT = C1 + C2 = 47nF + 47nF = 94nF or 0.094uF

b) Total Capacitance,

CT = C1 + C2 = 470nF + 1uF

therefore, CT = 470nF + 1000nF = 1470nF or 1.47uF

Therefore, the overall or comparable capacitance, CT of a power circuit having a couple of Capacitors in Parallel is the total of the each of the specific capacitance’s applied in sync as the effective section of the plates is amplified.