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09-07-2009, 09:49 PM
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#1
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Yard Boi
Trade:
Landscaping
Join Date: Aug 2009
Location: Genesee, ID
Posts: 440
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Anybody know anything about series circuits?
Getting caught up on class work.
Can somebody explain this relationship/formula in plain English? I thought it would come back to me since I was an EM3 in the USCG but nada.
Rt= 20ohms It= 5A Et= 100V Pt=500W
R1= 5ohms I1= 5A E1= 25V P1=125W
R2= 10ohms I2= 5A E2= 50V P2= 230W
R3= 5ohms I3= 5A E3= 25V P3= 125W
Any advice appreciated! 
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Bob's Lawn & Landscape
When You Want The Best
Serving the LC Valley & Moscow-Pullman
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09-07-2009, 10:00 PM
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#2
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Pro
Trade:
Remodeling general
Join Date: Feb 2009
Location: Annapolis Md
Posts: 1,512
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Unless you are doing really old Christmas tree lights this is useless information. Pretty much everything is done in paralell now.
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09-07-2009, 10:03 PM
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#3
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Yard Boi
Trade:
Landscaping
Join Date: Aug 2009
Location: Genesee, ID
Posts: 440
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Useless or not I gotta know it if I want to pass the class.
Got an exam on Thursday, throw me a bone brother!
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Bob's Lawn & Landscape
When You Want The Best
Serving the LC Valley & Moscow-Pullman
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09-07-2009, 10:13 PM
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#4
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LRG WoodCrafting
Trade:
Professional Sawdust Producer
Join Date: May 2005
Location: USA, Connecticut
Posts: 3,903
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Rt= 20ohms It= 5A Et= 100V Pt=500W
R1= 5ohms I1= 5A E1= 25V P1=125W
R2= 10ohms I2= 5A E2= 50V P2= 230W
R3= 5ohms I3= 5A E3= 25V P3= 125W
Resistant total = 20 ohms, Current total = 5 amps, Voltage total = 100v, Power total = 500w
R1+R2+R3=Rt
In a series circuit the current is constant
25v+50v+25v= 100v (Et)
125W+250W+125W=500W (there is an error in your statement, 5Ax50v=250W)
I x E = P
E / I = R
You can move these equations around to suit your need and figure out the missing data
P/E=I
P/I=E
R/E=I
R/I=E
Any more questions? 
__________________
Measure Twice Cut Once -- It's a lot easier to cut more off then it is to cut MORON.
Quote:
Originally Posted by HusqyPro
Carpenter by day.
Mad scientist by night.
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http://lrgwood.com
Last edited by Leo G; 09-07-2009 at 10:17 PM.
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09-07-2009, 10:21 PM
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#5
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Yard Boi
Trade:
Landscaping
Join Date: Aug 2009
Location: Genesee, ID
Posts: 440
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Holy hell. Ummm, this is harder than I thought.
Here's the one I'm trying to solve now:
Rt= ?ohms It= ?A ET= ?V Pt= 625W
R1= ?ohms I1=?A E1= ?V P1= ?W
R2= 100 ohms I2= 2A E2= ?V P2= ?W
R3= ?ohms I3= ?A E3=50V P3= ?W
I don't think I have enough data to solve that problem? Do I? I think I need more of the ? filled in so I can solve it.
__________________
Bob's Lawn & Landscape
When You Want The Best
Serving the LC Valley & Moscow-Pullman
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09-07-2009, 10:23 PM
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#6
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LRG WoodCrafting
Trade:
Professional Sawdust Producer
Join Date: May 2005
Location: USA, Connecticut
Posts: 3,903
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So, are you asking me to give you the answer? It's gonna cost you your desert ya know. And no frik'n fruit. 
__________________
Measure Twice Cut Once -- It's a lot easier to cut more off then it is to cut MORON.
Quote:
Originally Posted by HusqyPro
Carpenter by day.
Mad scientist by night.
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http://lrgwood.com
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09-07-2009, 10:24 PM
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#7
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Pro
Trade:
General, Electrical, and Plumbing Contractor
Join Date: Feb 2007
Location: Portland, OR & Eatonville, WA
Posts: 722
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Quote:
Originally Posted by HusqyPro
Getting caught up on class work.
Can somebody explain this relationship/formula in plain English? I thought it would come back to me since I was an EM3 in the USCG but nada.
Rt= 20ohms It= 5A Et= 100V Pt=500W
R1= 5ohms I1= 5A E1= 25V P1=125W
R2= 10ohms I2= 5A E2= 50V P2= 230W
R3= 5ohms I3= 5A E3= 25V P3= 125W
Any advice appreciated! |
That is just basic Ohm's Law.
From first line in example
Amps x Volts = Watts 5A x 100V = 500W
Watts / Volts = Amps 500W / 100V = 5A
Watts / Amps = Volts 500W / 5A = 100V
Volts / Amps = Ohms 100V / 5A = 20ohms
Amps x Ohms = Volts 20 ohms x 5A = 100V
The third line is wrong, should be 250 watts.
Just do a web search, there are some good sites about Ohm's Law in Series and Parallel Resistive circuits
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09-07-2009, 10:25 PM
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#8
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Pro
Trade:
General, Electrical, and Plumbing Contractor
Join Date: Feb 2007
Location: Portland, OR & Eatonville, WA
Posts: 722
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Leo beat me to it.
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09-07-2009, 10:26 PM
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#9
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Pro
Trade:
Remodeling general
Join Date: Feb 2009
Location: Annapolis Md
Posts: 1,512
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Quote:
Originally Posted by Leo G
Rt= 20ohms It= 5A Et= 100V Pt=500W
R1= 5ohms I1= 5A E1= 25V P1=125W
R2= 10ohms I2= 5A E2= 50V P2= 230W
R3= 5ohms I3= 5A E3= 25V P3= 125W
Resistant total = 20 ohms, Current total = 5 amps, Voltage total = 100v, Power total = 500w
R1+R2+R3=Rt
In a series circuit the current is constant
25v+50v+25v= 100v (Et)
125W+250W+125W=500W (there is an error in your statement, 5Ax50v=250W)
I x E = P
E / I = R
You can move these equations around to suit your need and figure out the missing data
P/E=I
P/I=E
R/E=I
R/I=E
Any more questions? |
Check out the head on Leo 
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09-07-2009, 10:30 PM
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#10
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Yard Boi
Trade:
Landscaping
Join Date: Aug 2009
Location: Genesee, ID
Posts: 440
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Leo is freaking smart.
No, not asking for the answer. Just trying to get caught up on what the class is doing. Missed the first two weeks because I was having heart surgery.
I don't want to be too far behind, especially since I'll be missing more class time with radi, chemo, and more surgery.
So to fnd the t line I work back from 625 watts? TheI line is going to be 2A all the way because amperage doesn't change in a series circuit?
__________________
Bob's Lawn & Landscape
When You Want The Best
Serving the LC Valley & Moscow-Pullman
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09-07-2009, 10:31 PM
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#11
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LRG WoodCrafting
Trade:
Professional Sawdust Producer
Join Date: May 2005
Location: USA, Connecticut
Posts: 3,903
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Rt= ?ohms It= ?A ET= ?V Pt= 625W
R1= ?ohms I1=?A E1= ?V P1= ?W
R2= 100 ohms I2= 2A E2= ?V P2= ?W
R3= ?ohms I3= ?A E3=50V P3= ?W
Ok, I'll see if I can walk you through it.
Current is constant through the system so all of the I=2A
You have 625W for the Pt and you have a current so you should be able to figure out Et
P3 is also figured out for you because you know that I=2A
Because now you know I3 and E3 you can figure out R3
Because you know R2 and I2 you can figure out E2 and then P2
Now the rest is figured out from subtraction Because you know equation 2 and 3 you just have to put in what must remain to get the total equation.
__________________
Measure Twice Cut Once -- It's a lot easier to cut more off then it is to cut MORON.
Quote:
Originally Posted by HusqyPro
Carpenter by day.
Mad scientist by night.
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http://lrgwood.com
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09-07-2009, 10:36 PM
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#12
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Pro
Trade:
Remodeling general
Join Date: Feb 2009
Location: Annapolis Md
Posts: 1,512
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Quote:
Originally Posted by HusqyPro
Leo is freaking smart.
No, not asking for the answer. Just trying to get caught up on what the class is doing. Missed the first two weeks because I was having heart surgery.
I don't want to be too far behind, especially since I'll be missing more class time with radi, chemo, and more surgery.
So to fnd the t line I work back from 625 watts? TheI line is going to be 2A all the way because amperage doesn't change in a series circuit?
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Yo Bob maybe your health comes first?
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09-07-2009, 10:37 PM
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#13
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Yard Boi
Trade:
Landscaping
Join Date: Aug 2009
Location: Genesee, ID
Posts: 440
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So far I have:
Rt= 156.25ohms It=2A Et=312.5V Pt= 625W
Close?
__________________
Bob's Lawn & Landscape
When You Want The Best
Serving the LC Valley & Moscow-Pullman
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09-07-2009, 10:39 PM
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#14
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Yard Boi
Trade:
Landscaping
Join Date: Aug 2009
Location: Genesee, ID
Posts: 440
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Quote:
Originally Posted by naptown CR
Yo Bob maybe your health comes first?
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Actually I feel much better. I can walk to the truck without gasping for breath, feeling faint, and with a racing pulse.
Amazing what a new pacemaker can do.
__________________
Bob's Lawn & Landscape
When You Want The Best
Serving the LC Valley & Moscow-Pullman
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09-07-2009, 10:44 PM
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#15
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#1 stunner
Trade:
Design/Build
Join Date: Nov 2008
Posts: 323
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Thanks leo for typing that out, I was fixing to do it for him: Now I can go back to this rendering. 
__________________
Will do autocad/ 3d work for food.
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09-07-2009, 10:44 PM
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#16
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LRG WoodCrafting
Trade:
Professional Sawdust Producer
Join Date: May 2005
Location: USA, Connecticut
Posts: 3,903
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Quote:
Originally Posted by HusqyPro
So far I have:
Rt= 156.25ohms It=2A Et=312.5V Pt= 625W
Close?
|
 Very good grasshopper
Now let us introduce you to variable frequency in a capacitance/impedance circuit in a 3 phase system...... 
__________________
Measure Twice Cut Once -- It's a lot easier to cut more off then it is to cut MORON.
Quote:
Originally Posted by HusqyPro
Carpenter by day.
Mad scientist by night.
|
http://lrgwood.com
Last edited by Leo G; 09-07-2009 at 10:47 PM.
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09-07-2009, 10:49 PM
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#17
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LRG WoodCrafting
Trade:
Professional Sawdust Producer
Join Date: May 2005
Location: USA, Connecticut
Posts: 3,903
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Quote:
Originally Posted by Full Spool
Thanks leo for typing that out, I was fixing to do it for him: Now I can go back to this rendering. |
Electronic cabinet maker to the rescue..... 
__________________
Measure Twice Cut Once -- It's a lot easier to cut more off then it is to cut MORON.
Quote:
Originally Posted by HusqyPro
Carpenter by day.
Mad scientist by night.
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http://lrgwood.com
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09-07-2009, 10:51 PM
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#18
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Yard Boi
Trade:
Landscaping
Join Date: Aug 2009
Location: Genesee, ID
Posts: 440
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Final answer:
Rt= 156.25ohms It= 2A Et=312.5V Pt=625W
R1= 1.25ohms I1= 2A E1= 62.5V P1= 125W
R2= 100ohms I2=2A E2= 200V P2= 400W
R3= 25ohms I3=2A E3= 50V P= 100W
I don't know how it works, but it looks rigt to me.
This is why electricians make $100+ an hour.
__________________
Bob's Lawn & Landscape
When You Want The Best
Serving the LC Valley & Moscow-Pullman
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09-07-2009, 10:54 PM
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#19
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LRG WoodCrafting
Trade:
Professional Sawdust Producer
Join Date: May 2005
Location: USA, Connecticut
Posts: 3,903
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You got the numbers right but R1 is written wrong.
__________________
Measure Twice Cut Once -- It's a lot easier to cut more off then it is to cut MORON.
Quote:
Originally Posted by HusqyPro
Carpenter by day.
Mad scientist by night.
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http://lrgwood.com
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09-07-2009, 10:57 PM
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#20
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LRG WoodCrafting
Trade:
Professional Sawdust Producer
Join Date: May 2005
Location: USA, Connecticut
Posts: 3,903
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So when you get to parallel circuits just remember that the voltage is constant and the current is variable.
__________________
Measure Twice Cut Once -- It's a lot easier to cut more off then it is to cut MORON.
Quote:
Originally Posted by HusqyPro
Carpenter by day.
Mad scientist by night.
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http://lrgwood.com
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The Following User Says Thank You to Leo G For This Useful Post:
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