How Does Angular Frequency Affect AC Voltage Across a Resistor?

tomeatworld
Messages
49
Reaction score
0

Homework Statement


For the circuit below (attached) plot the amplitude of AC voltage across resistor as a function of the angular frequency of the ac source.


Homework Equations


ZR = R

The Attempt at a Solution


I'm not really sure about any of this. Across the resistor, the complex impredence is just R and so has no dependence on the angular frequency, but just plotting a stright line with amplitude IR can't be worth 5 marks (which is the marks for this question). Can someone explain this to me?
 

Attachments

  • circuit.png
    circuit.png
    751 bytes · Views: 453
Physics news on Phys.org
The current I varies with frequency.
 
the L & C impedances vary with frequency.
So, the voltage across the resistor should also vary as it is in series with the L-C combination.

Find out the total impedance of the parallel combination of L & C (which is a function of w).
Now R is in series with this combo-impedance.
 
Thread 'Need help understanding this figure on energy levels'

Thread 'Need help understanding this figure on energy levels'

This figure is from "Introduction to Quantum Mechanics" by Griffiths (3rd edition). It is available to download. It is from page 142. I am hoping the usual people on this site will give me a hand understanding what is going on in the figure. After the equation (4.50) it says "It is customary to introduce the principal quantum number, ##n##, which simply orders the allowed energies, starting with 1 for the ground state. (see the figure)" I still don't understand the figure :( Here is...
View full post »
Thread 'Understanding how to "tack on" the time wiggle factor'

Thread 'Understanding how to "tack on" the time wiggle factor'

The last problem I posted on QM made it into advanced homework help, that is why I am putting it here. I am sorry for any hassle imposed on the moderators by myself. Part (a) is quite easy. We get $$\sigma_1 = 2\lambda, \mathbf{v}_1 = \begin{pmatrix} 0 \\ 0 \\ 1 \end{pmatrix} \sigma_2 = \lambda, \mathbf{v}_2 = \begin{pmatrix} 1/\sqrt{2} \\ 1/\sqrt{2} \\ 0 \end{pmatrix} \sigma_3 = -\lambda, \mathbf{v}_3 = \begin{pmatrix} 1/\sqrt{2} \\ -1/\sqrt{2} \\ 0 \end{pmatrix} $$ There are two ways...
View full post »

Similar threads

Alternator torque when connected to a phase-shifted AC source
Replies
3
Views
2K
Engineering Understanding the output waveform and using LTSpice
Replies
1
Views
2K
Engineering How Does a Capacitor Affect Ripple Voltage in a Diode Circuit?
Replies
15
Views
6K
I Physics domain analysis of Voltage drop in series resistor
Replies
7
Views
2K
Calculation of current in driven series RLC circuit
Replies
8
Views
2K
When Is the Potential Across a Capacitor Equal to That Across a Resistor?
Replies
2
Views
2K
Finding the Voltage across a Resistor using the Node Voltage Method
Replies
2
Views
2K
I How is Potential Difference Created across a Resistor?
Replies
21
Views
4K
Engineering Why is the voltage source high potential into node 1 at -12 V in this op amp problem?
Replies
15
Views
2K
Measuring Voltage across Resistor in Series RLC Circuit
Replies
7
Views
4K

Hot Threads

Recent Insights

Back
Top