#3037982 - 06/23/10 03:30 PM
Electricity Math Problem
|
Joined: Jun 2007
Posts: 630
Ltfransky
Sith Lord
|
Sith Lord
Member
Joined: Jun 2007
Posts: 630
Peterborough, ON, Canada
|
Ok, I need help. I have this problem and I need guidance to the solution. I've figured out that Total amps is 1, and the total resistance is 120 Ohms. But I'm having trouble with the individual voltage drops.
Last edited by Ltfransky; 06/23/10 03:31 PM.
Please Heatware Me!Ours is not to reason why. Ours is to do or die. Tennyson I have slipped the surly bonds of earth And danced the skies on laughter-silvered wings.. Gillespie Magee, RCAF
|
|
#3038149 - 06/23/10 07:30 PM
Re: Electricity Math Problem
[Re: hansundfranz]
|
Joined: May 2010
Posts: 3,812
JAMF
Frugalite & P-38 fan
|
Frugalite & P-38 fan
Senior Member
Joined: May 2010
Posts: 3,812
The Netherlands
|
The answer F-A and F-B is the same, as they are the same potential. Almost a trick question.
It helps if you simplify the schematic, by replacing the parallel resistors with a single resistor.
Simplify as much as you can, you can always go back to a schematic that sits between original and simplicity.
where the 1 amp divides, write the values down.
[EDIT] Oh yeah, make the schematic go in a straight line from A (top) to F (bottom) and only use 'sidetracks' when you have to, since the 'twists' and turns are just there to confuse.
Last edited by JAMF; 06/23/10 07:36 PM.
|
|
#3038258 - 06/23/10 09:45 PM
Re: Electricity Math Problem
[Re: JAMF]
|
Joined: May 2004
Posts: 158
Ragman
Member
|
Member
Joined: May 2004
Posts: 158
|
It helps if you simplify the schematic, by replacing the parallel resistors with a single resistor.
Simplify as much as you can, you can always go back to a schematic that sits between original and simplicity.
Here's how I was taught to simplify: 1. Do you see two or more resistors in series? - If yes, combine and redraw. - If no, go to question #2. 2. Do you see two or more resistors in parallel? - If yes, combine and redraw. - If no, go to question #1.
What does an agnostic dyslexic do when experiencing insomnia? ANSWER: Sit up all night wondering if there really is a dog.
|
|
#3038292 - 06/23/10 11:27 PM
Re: Electricity Math Problem
[Re: JAMF]
|
Joined: Jun 2007
Posts: 630
Ltfransky
Sith Lord
|
Sith Lord
Member
Joined: Jun 2007
Posts: 630
Peterborough, ON, Canada
|
Wouldn't the last one be 120 Ohms? I understood the simplifying part of the circuits.
But when I try to calculate the Amp split and the voltage drop at the first parallel section (A-C), I'm a little stumped.
I tried to calculate F-C by using V = (35+35+71.4 Ohms) x 1 Amp. This gives me a voltage drop of 141.4 volts. But that doesn't seem right to me since I only have 120V to start. Maybe the current needs to split, but I don't know.
Please Heatware Me!Ours is not to reason why. Ours is to do or die. Tennyson I have slipped the surly bonds of earth And danced the skies on laughter-silvered wings.. Gillespie Magee, RCAF
|
|
#3038352 - 06/24/10 12:58 AM
Re: Electricity Math Problem
[Re: Ltfransky]
|
Joined: May 2004
Posts: 158
Ragman
Member
|
Member
Joined: May 2004
Posts: 158
|
Nice job on the schematics. Just an oopsie in the last one. DOH! It's fixed now. I just forgot to change the label after the last diagram change. Wouldn't the last one be 120 Ohms? I understood the simplifying part of the circuits.
But when I try to calculate the Amp split and the voltage drop at the first parallel section (A-C), I'm a little stumped.
I tried to calculate F-C by using V = (35+35+71.4 Ohms) x 1 Amp. This gives me a voltage drop of 141.4 volts. But that doesn't seem right to me since I only have 120V to start. Maybe the current needs to split, but I don't know. Remember that you have that 100ohm resistor (R6) in parallel. Here's a diagram of how that voltage drop measures when the circuit simulation is run.
What does an agnostic dyslexic do when experiencing insomnia? ANSWER: Sit up all night wondering if there really is a dog.
|
|
#3038747 - 06/24/10 04:45 PM
Re: Electricity Math Problem
[Re: Ltfransky]
|
Joined: May 2010
Posts: 3,812
JAMF
Frugalite & P-38 fan
|
Frugalite & P-38 fan
Senior Member
Joined: May 2010
Posts: 3,812
The Netherlands
|
I tried to calculate F-C by using V = (35+35+71.4 Ohms) x 1 Amp. This gives me a voltage drop of 141.4 volts. But that doesn't seem right to me since I only have 120V to start. Maybe the current needs to split, but I don't know. Yeah, you're formula will be V = (35+35) x 1 Amp + (71.4 Ohms x "Nleft" Amp) You just need to determine the amount of Ampere that flows in the left arm.
|
|
#3085035 - 09/02/10 12:12 AM
Re: Electricity Math Problem
[Re: Ltfransky]
|
Joined: Jun 2007
Posts: 630
Ltfransky
Sith Lord
|
Sith Lord
Member
Joined: Jun 2007
Posts: 630
Peterborough, ON, Canada
|
Ok. Here we go. Please tell me if I'm right.
F-E=35V F-D=70V F-C=105.7V F-B=120V F-A=120V B-D=50V D-E=35V It=1 Amp
Please Heatware Me!Ours is not to reason why. Ours is to do or die. Tennyson I have slipped the surly bonds of earth And danced the skies on laughter-silvered wings.. Gillespie Magee, RCAF
|
|
#3085580 - 09/02/10 06:39 PM
Re: Electricity Math Problem
[Re: Ltfransky]
|
Joined: May 2010
Posts: 3,812
JAMF
Frugalite & P-38 fan
|
Frugalite & P-38 fan
Senior Member
Joined: May 2010
Posts: 3,812
The Netherlands
|
|
|
#3085618 - 09/02/10 07:13 PM
Re: Electricity Math Problem
[Re: Ltfransky]
|
Joined: Apr 2001
Posts: 6,723
bones
Hotshot
|
Hotshot
Joined: Apr 2001
Posts: 6,723
Earth
|
And this is why I went with mechanical engineering rather than electrical
v6, boNes
"Also, I would prefer a back seater over the extra gas any day. I would have 80 pounds of flesh to eat and a pair of glasses to start a fire." --F/A-18 Hornet pilot
|
|
#3085639 - 09/02/10 07:42 PM
Re: Electricity Math Problem
[Re: Ltfransky]
|
Joined: May 2010
Posts: 3,812
JAMF
Frugalite & P-38 fan
|
Frugalite & P-38 fan
Senior Member
Joined: May 2010
Posts: 3,812
The Netherlands
|
Oh, it's not that bad, Bones. Just formulas and rules one has to come to grips with, like in engineering. Amps, voltages, power, flux, capacitance, they all are not too hard to grasp. Transistors on the other hand, they'll trip you up.
|
|
#3085813 - 09/02/10 11:00 PM
Re: Electricity Math Problem
[Re: Ltfransky]
|
Joined: Jun 2007
Posts: 630
Ltfransky
Sith Lord
|
Sith Lord
Member
Joined: Jun 2007
Posts: 630
Peterborough, ON, Canada
|
Thanks guys. (And JAMF in particular)
Please Heatware Me!Ours is not to reason why. Ours is to do or die. Tennyson I have slipped the surly bonds of earth And danced the skies on laughter-silvered wings.. Gillespie Magee, RCAF
|
|
#3134520 - 11/10/10 06:24 PM
Re: Electricity Math Problem
[Re: Ltfransky]
|
Joined: Jun 2007
Posts: 630
Ltfransky
Sith Lord
|
Sith Lord
Member
Joined: Jun 2007
Posts: 630
Peterborough, ON, Canada
|
Yes! 89% on my Gas Technician 3 written exam!
Please Heatware Me!Ours is not to reason why. Ours is to do or die. Tennyson I have slipped the surly bonds of earth And danced the skies on laughter-silvered wings.. Gillespie Magee, RCAF
|
|
|
|