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What is the voltage across the resistor?

  • Thread starter JayLewis
  • Start date
  • #1
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Homework Statement



The amplitude of the voltage across an entire series circuit is 17 V. The inductor alone has an amplitude of 30 V and across the capacitor it is 22 V. To the nearest tenth, what is the voltage across the resistor?


Homework Equations





The Attempt at a Solution



(17+8i)(17-8i)

289+64
square root of 353
18.8
 

Answers and Replies

  • #2
gneill
Mentor
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Homework Statement



The amplitude of the voltage across an entire series circuit is 17 V. The inductor alone has an amplitude of 30 V and across the capacitor it is 22 V. To the nearest tenth, what is the voltage across the resistor?


Homework Equations





The Attempt at a Solution



(17+8i)(17-8i)

289+64
square root of 353
18.8
Hello JayLewis, Welcome to Physics Forums.

Can you explain the reasoning behind your attempt?
 
  • #3
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0
I was trying to follow steps from handout

I was trying to follow steps from handout..this is the first time we have worked onthis and I don't understand it.
 
  • #4
gneill
Mentor
20,730
2,728
Okay. I see that you're making use of complex numbers, so I assume that you're familiar with (or at least learning about) the concept of complex impedance and voltage and current. Is that right?
 
  • #5
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we are learning about it now

but the instructions aren't very clear

here is the rest of my work:

374-510i
_________
484+900

374-510i
_________
1384

.27-.37i
.07+.14
.21
 
  • #6
gneill
Mentor
20,730
2,728
but the instructions aren't very clear

here is the rest of my work:

374-510i
_________
484+900

374-510i
_________
1384

.27-.37i
.07+.14
.21
It's difficult to comment on your work since it's not annotated. What is it you're doing here?

If I may make a suggestion, suppose you consider the series RLC circuit being driven by a fixed AC current source. What would be the complex values of the potentials across the capacitor and inductor?
 

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