Power Consumption Math

Discussion in 'General Electronics Chat' started by 7anoter4, Nov 11, 2013.

1. 7anoter4 Thread Starter New Member

Nov 11, 2013
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0
Moderator edit: This was split from total power consumption

If the actual diagram would be Rtot=R1+R2||R3 =R1+R2*R3/(R2+R3)=543.46 ohm then the power consumption will be 450^2/543.46=372.62 w only.You have to supply 459.67 V in order to get 388.8 w.

Last edited by a moderator: Nov 11, 2013
2. WBahn Moderator

Mar 31, 2012
18,087
4,917
Redo your math. Since you didn't show the details of how you arrived at 543.46Ω, we can't even guess where you might have gone wrong.

3. Wendy Moderator

Mar 24, 2008
20,772
2,540
We don't allow hijacking (taking over someone elses thread) at AAC, so now you have one of your own.

As I mentioned in the other thread, schematics are the language of electronics. Without a schematic, there is no way to match your math to the problem.

I explain how to attach a schematic in the other thread.

4. WBahn Moderator

Mar 31, 2012
18,087
4,917
I don't know that this was really a hijacking as opposed to someone just saying that they are not getting the same answer to the same problem. But since I think the OP is probably taken care of, it is not unreasonable to split it off, either.

5. MikeML AAC Fanatic!

Oct 2, 2009
5,451
1,066
The LTSpice sim and schematic I posted way back in post #4 of the original Math thread had the circuit topology right because it did indeed dissipate 388.8W with 450V applied.

6. 7anoter4 Thread Starter New Member

Nov 11, 2013
3
0
If the actual diagram would be Rtot=R1+R2||R3 =R1+R2*R3/(R2+R3)=543.46 ohm then the power consumption will be 450^2/543.46=372.62 w only.You have to supply 459.67 V in order to get 388.8 w.You may, also reduce the R3 resistance from 470 to 417.4 ohm to get the same.

7. WBahn Moderator

Mar 31, 2012
18,087
4,917
At the risk of repeating myself.

Again. Check your math on that equivalent resistance.

Again. Show your math on that equivalent resistance.

Again. Your result for the equivalent resistance is wrong.

Again. We can't point out where you went wrong unless you show your work.

For instance, just by saying that you can reduce R3 from 470Ω to something else gives a pretty big hint as to what your problem is since R3 isn't 470Ω to begin with.