tjr39
Mar10-08, 03:04 AM
1. The problem statement, all variables and given/known data
Given an RC circuit which has a Capacitor (C=6\times 10^{-6} F) and a resistor (R=5 \Omega) conected in series to an a.c. voltage sorce of the form v=V_{0} e^{j\omega t} with a V_{0}=1 Volt. Frequency f=10kHz
a)What is the phase of the current with respect to the applied voltage?
b) What is the magnitude of the current?
2. Relevant equations
Z=Z_{R}+Z_{C}
Z_{C}=\frac{1}{j\omega C}
Z=x+jy where j=\sqrt{-1}
Z=ze^{j \phi} with z=\sqrt{x^{2}+y^{2}} and \phi =tan^{-1} \frac{y}{x}
\omega = 2\pi \times f
3. The attempt at a solution
\frac{1}{\omega C} = 2.65
Z=R+ \frac{1}{j\omega C}
=5-2.65j
Which can be written as Z=ze^{j\phi}
z=\sqrt{5^{2}+2.65^{2}}=5.66
\phi =tan^{-1}\frac{-2.65}{5}=-27.9 degrees
Since i=\frac{V_{0}}{z}e^{j(\omega t-\phi)} then I can say the current leads the voltage by 27.9 degrees.
And I can also say the magnitude of the current i is equal to \frac{V_{0}}{z}=\frac{1}{5.66}
How did I go?? Am I on track anywhere at all or have I made a bit of a mess of it?
1. The problem statement, all variables and given/known data
2. Relevant equations
3. The attempt at a solution
Given an RC circuit which has a Capacitor (C=6\times 10^{-6} F) and a resistor (R=5 \Omega) conected in series to an a.c. voltage sorce of the form v=V_{0} e^{j\omega t} with a V_{0}=1 Volt. Frequency f=10kHz
a)What is the phase of the current with respect to the applied voltage?
b) What is the magnitude of the current?
2. Relevant equations
Z=Z_{R}+Z_{C}
Z_{C}=\frac{1}{j\omega C}
Z=x+jy where j=\sqrt{-1}
Z=ze^{j \phi} with z=\sqrt{x^{2}+y^{2}} and \phi =tan^{-1} \frac{y}{x}
\omega = 2\pi \times f
3. The attempt at a solution
\frac{1}{\omega C} = 2.65
Z=R+ \frac{1}{j\omega C}
=5-2.65j
Which can be written as Z=ze^{j\phi}
z=\sqrt{5^{2}+2.65^{2}}=5.66
\phi =tan^{-1}\frac{-2.65}{5}=-27.9 degrees
Since i=\frac{V_{0}}{z}e^{j(\omega t-\phi)} then I can say the current leads the voltage by 27.9 degrees.
And I can also say the magnitude of the current i is equal to \frac{V_{0}}{z}=\frac{1}{5.66}
How did I go?? Am I on track anywhere at all or have I made a bit of a mess of it?
1. The problem statement, all variables and given/known data
2. Relevant equations
3. The attempt at a solution