The plots shown here are the voltage across and the current

The plots shown here are the voltage across and the current through an ideal capacitor. Determine the capacitance.

Solution

V(t) = voltage across capacitor

=-3 ,0<t<=1

=-3+ (t-1) , 1<t<=3

=-1, t>3

i(t)= current

=50 mA, 1<t<3

=0 , else

As we know, i= C*dV/dt

i= C*1 , 1<t<3

50 mA= C*1

C= 50 mF