Combination of capacitors in parallel
Wire the circuit as shown in the following figure 2. for a resistance R = 3.8MΩ . and two capacitors of C1 =2 μF and C2=1 μF.

Note :
Method :
a- On graph paper, plot the voltage Uc= f(t)
b- Plot the tangent to the origin point and determine the time constant, τ = RC; the abscissa of the point of intersection of this tangent with the limit voltage of the load.
c- From the time constant ensure the value of C.
d- Compare this value to the equivalent one of two capacitors in parallel
Capacitors in parallel
The equivalent one of two capacitors in parallel is given by
\[C_{eq}= C_{1} + C_{2}\]
Compare this value to the equivalent one of two capacitors in parallel
Extra :
In this graph we found τ is 11.8s which is close to the calculated one τ = RC = 11.4s
