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basic electrical, resistors


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astrikrace 
Member - Posts: 10
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Joined: May 12, 2008
Location: Texas, United States
Posted: June 02, 2008 at 6:24 PM / IP Logged  
I got into and argument with my Professor at my comunity college. Talking about a parallel circuit with two legs, one leg has a 1 ohm resistor and a 3 ohm resistor and the other leg has two 2 ohm resistors. What is the total resistance and current?
i am an idiot 
Platinum - Posts: 13,669
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Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 02, 2008 at 7:45 PM / IP Logged  

  If     the 2 legs have the resistors you mentioned wired in series and then each leg paralleled, the total resistance would be 2 Ohms.  Each leg will have identical current going through them. 

I can't answer how much current without knowing how much voltage is present.  

astrikrace 
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Joined: May 12, 2008
Location: Texas, United States
Posted: June 03, 2008 at 10:19 AM / IP Logged  

Sorry 12 volts and I got a total of 6 amps with 3 amps on each leg. He said the total resistance has to be less than the lowest  individual resistor and I told him that it has to be less then the lowest legs resistance. So he said the resistance is .4 with 30 amps. I think I'm ganna just take over and start teaching the class.

Big Dog 
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Location: Quebec, Canada
Posted: June 03, 2008 at 10:48 AM / IP Logged  

Let's see if I understood.

Is it diagram A or B?

If it's A, then your teacher's right.

If it's neither, draw up a quickie in paint.

basic electrical, resistors -- posted image.

Prepare your future. It wasn't the lack of stones that killed the stone age.
astrikrace 
Member - Posts: 10
Member spacespace
Joined: May 12, 2008
Location: Texas, United States
Posted: June 03, 2008 at 11:16 AM / IP Logged  

Alright My teachers an idiot. in our work book it is exactly like B. and with 12 volts am I right about the current?

Big Dog 
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Posted: June 03, 2008 at 2:34 PM / IP Logged  

Ohms law states that:

I=V/R

Thus

I=12/2

I=6 amps

Prepare your future. It wasn't the lack of stones that killed the stone age.
astrikrace 
Member - Posts: 10
Member spacespace
Joined: May 12, 2008
Location: Texas, United States
Posted: June 04, 2008 at 12:17 AM / IP Logged  

Ok yea 6 amps total with 3 amps on each leg, like I said.

Now, How do I approach the teacher in an appropriate way to say " I'm right, and your wrong!"

Big Dog 
Gold - Posts: 1,265
Gold spaceThis member consistently provides reliable informationspace
Joined: May 02, 2002
Location: Quebec, Canada
Posted: June 04, 2008 at 12:46 PM / IP Logged  

Humbly start with, "Can you tell me if I'm doing this correctly."  Then, show him on paper how you would solve the problem using what you learned so far and wait for his reaction.

He'll be proud to see your progress and have greater respect for you than if you started with an "I told you so" attitude.

Troubleshooting isn't an ego trip......it's math and logic.

BTW, my definition of a good teacher is someone who eventually becomes useless to his student. (Think about it a minute).

So, it seems like he's doing a good job so far. basic electrical, resistors -- posted image.

Prepare your future. It wasn't the lack of stones that killed the stone age.

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