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11-08-2010, 05:39 PM   #1
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## Theory Question

In a resistive-inductive circuit (RL circuit), the resistive current is 90 degrees or less out of phase with the inductive current (visa versa). Which one is leading or lagging the other? I would take a guess and say the resistive current leads the inductive current, but maybe someone remembers their theory. I know this is a diy forum, but I'm just trying to pick your electrician brains because I can't figure it out.

11-08-2010, 05:47 PM   #2
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nobody ever told you about ELI the ICE man?

the 3 types of currents must be resolved with each other to determine if the current is considered resistive, inductive, or capacitive in nature. Then you can determine if current or voltage leads.

Last edited by nap; 11-08-2010 at 05:51 PM.

 11-08-2010, 06:04 PM #3 Newbie   Join Date: Oct 2010 Posts: 6 Rewards Points: 10 I'm talking about solely current, not voltage, I know the rules about current leading voltage and so on. I am talking about resistive current compared to inductive current in a purely resistive-inductive circuit, no capacitance.

11-08-2010, 06:08 PM   #4
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Quote:
 Originally Posted by ader220 I'm talking about solely current, not voltage, I know the rules about current leading voltage and so on. I am talking about resistive current compared to inductive current in a purely resistive-inductive circuit, no capacitance.
ok, think about this. If that little ditty allows your to know which current leads E, don't you think that it would also apply to resistive current which is in phase with E?

geesh. kids now a days.

 11-08-2010, 06:34 PM #5 Newbie   Join Date: Oct 2010 Posts: 6 Rewards Points: 10 nevermind
11-08-2010, 06:48 PM   #6
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Quote:
I gave you all you need to be able to figure it out. I almost gave you the answer and I get a nevermind?

have a great day.

I guess you have never heard the old addage:

give a man a fish and he eats for a day. Teach a man to fish and he eats for life.
I simply refuse to give you a fish and you get upset. Oh well, I guess you will have to learn to fish on your own.

11-09-2010, 06:28 AM   #7
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Quote:
 Originally Posted by nap I guess you have never heard the old addage: give a man a fish and he eats for a day. Teach a man to fish and he eats for life.
Nap, The adage is "Give a man a fish and he eats for a day. Teach a man to fish and he sits in a boat and drinks beer all day"

 The Following 4 Users Say Thank You to 47_47 For This Useful Post: del schisler (11-09-2010), nap (11-09-2010), tcleve4911 (11-09-2010), Tom Struble (11-09-2010)
 11-09-2010, 10:46 AM #8 Member   Join Date: Jul 2009 Location: SW Ohio Posts: 783 Rewards Points: 1,010 Since you didn't specify if the circuit was in series or parallel, I'll guess it was in series and the answer is it doesn't lead or lag. The basic thing to remember is inductors resist a change in current, so they tend to lag current-wise. Capacitors resist a change in voltage, so they will lag, voltage-wise. Since I jumped into this conversation, I will now go out in your boat, use your fishing gear, AND drink all your beer!!
11-09-2010, 02:29 PM   #9
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Quote:
 geesh. kids now a days.
Sorry, I didn't take this remark well. I did find out thought that resistive current leads.

11-09-2010, 03:14 PM   #10
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Quote:
 Originally Posted by ader220 Sorry, I didn't take this remark well. I did find out thought that resistive current leads.
I was just trying to get you to think since what I provided did allow you to determine the answer. In the ELI part of that mnemonic device, it reminds us that volts leads current in an inductive circuit and since resistive I and E are in phase, that means resistive current will lead inductive current.

Didn't mean to anger ya. Since I am old, I look back at myself when I asked a lot of questions. I realized at some times, all I wanted was the specific answer to a question but more often, if I learned how to determine the answer, it was knowledge that could be applied to other situations so I didn't have to ask similar questions.

If you are asking questions such as this, I would have to guess you are in some sort of class where while the specific answer took care of the question at hand; understanding what I told you educated you a bit and allows you to apply that to other questions.

The comment was meant to be humor, not derisive. If you were offended; my apologies. It was not meant as such.

 11-09-2010, 04:15 PM #11 Newbie   Join Date: Oct 2010 Posts: 6 Rewards Points: 10 I see your point, thanks for the info.
11-09-2010, 07:43 PM   #12
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wwhoa...that was suposed to be funny?...now i'm insulted

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