# Transients in RLC-circuits calculated using the Ti-84 Plus

In RLC electric circuits, special phenomena can occur (such as resonance). The behavior of the RLC circuit depends on the values of R, L and C. With the second order differential solver program and the post process program the phenomena can be investigated which is important for electrical engineering.

For extra information about the second order differential equation solver, go to :

### Example (see scheme) with: R1=10 Ω, L1=100 mH, C1=10 uF, V1=12V DC

### Formulas for the electric circuit and applied in the Ti-Basic program

For this case, it yields :

y=Uc1, A=L1C1=1E-6, B-=R1C1=1E-4,

C=1, f(x) =12V

For numerical processes, the step size is an important parameter. For this example, next step size is chosen.

Step size dx < √(A/C) /100 = √((1E-6))/100 =0.001/100=1E-5 sec or dx <(B/C)/20 = 0.025 sec

Take the smallest step size of dx which is dx=0.00001=1E-5 sec for this example.

More info about the step size, go to :

The result obtained with the Ti show that at 3.12 msec the maximum capacitor voltage equals 22.25 V. The Ti results approach the results of Multisim and the analytical solution extremely well. At t=0.22 sec, values of the numerical program and the analytical solution agree.

## Results Multisim analytical solution

News July 2023: The third version DV2ETRV3 is now available with 999 calculated points stored.

For questions or a request for the program, mail to frieboon@gmail.com or chat and the program will be sent. Don't forget to include your email address!!

News July 2023: The third version DV2ETRV3 is now available with 999 calculated points stored.

For questions or a request for the program, mail to ti84.org@gmail.com and the program will be sent. Don't forget to include your email address!!