- #1

- 18

- 0

^{-t/τ}. So here comes my question should I consider the capacitor as the load and calculate the Thevenin equivalent voltage at t=0 and t=∞ and use the X(t)=X(0)+[X(0)-X(∞)]

^{-t/τ}forumla ,where τ=R

_{Th}C.

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter DIrtyPio
- Start date

- #1

- 18

- 0

- #2

- 31,087

- 7,766

- #3

- 18

- 0

Ok, I have some circuits and I don't know if I resolved the problems right so here are they:

and I have another question: files

1. The voltage of an ideal a.c. source has the expression:

u_{g} = 100 *2^{0.5}sin (2*10^{4} ∏*t +∏/3) V.

1.1. Find the value of the frequency and the value of the voltage at the moment t=0

1.2. Find the complex expression and the rms value of the current if the source supplies the impedance consisting in the resistance of 80 Ω connected in series with the inductance of 3/∏ mH (0.955 mH).

I don't really know what does it mean at the question 1.1. The frequency at the moment t=0. The voltage is 100 *2^{0.5}sin (∏/3).

The second question(1.2) I've solved like this:

U_{RMS}=100V ; R=80Ω ; L=3mH => X_{L}=j*2*10^{4}∏*3/∏*10^{-3}=j*60Ω.

I_{RMS}=U_{RMS}/|Z|, where |Z|=(80^{2}+60^{2})^{1/2}=100Ω => I_{RMS}=100/100=1A.

And the complex expression of the current is U_{complex}/R_{complex}=100^{j∏/3}/j60=100(cos∏/3+jsin∏/3)/j60=100(1/2+j3^{1/2}/2)/j60=50+j50*(3^{1/2})/j60.

Is this correct?

and I have another question: files

1. The voltage of an ideal a.c. source has the expression:

u

1.1. Find the value of the frequency and the value of the voltage at the moment t=0

1.2. Find the complex expression and the rms value of the current if the source supplies the impedance consisting in the resistance of 80 Ω connected in series with the inductance of 3/∏ mH (0.955 mH).

I don't really know what does it mean at the question 1.1. The frequency at the moment t=0. The voltage is 100 *2

The second question(1.2) I've solved like this:

U

I

And the complex expression of the current is U

Is this correct?

Last edited:

Share: