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Calculating power in a series-parallel circuit

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Emil09

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Hello,

I'm trying to verify that I correctly calculated the power in R5 shown in the circuit below.

**broken link removed**

I first determined that the voltage over R5 is 4.91 v. Then I calculated power as P = (V^2)/R5 = 4.3 mW. I would greatly appreciate it if anyone could verify my calculations. Thanks!
 
R5 isnt in parallel with R3/R4......See your third line
 
Calc the value of R3 in parallel with R4 (514.29 ohms)....add R2 to that ( 144.29) , then calc that result in parallel with R5...(950.14)...call that Rz
Add that to R1...

Calc the current Iw thru R1+Rz...

then Pdiss in R5 = Iw squared*R5
 
Why don't you use mesh analysis? you do the three meshes find the current thru R5, and you're done, it will be very fast if you use a graphing calculator.
 
Why don't you use mesh analysis? you do the three meshes find the current thru R5, and you're done, it will be very fast if you use a graphing calculator.

I'm afraid that I haven't studied mesh analysis at all. But I'll look into that; thanks.
 
Last edited:
Actually, what I'm really trying to verify is the following:
**broken link removed**
for the circuit I originally posted.

Thank you.
 
As I see it, it's good, you'll get a the result, as long as you don't make a mistake with the numbers.
 
As you see, there's a bunch of people here that can help you, hope you do it good.
 
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