# Finding resistance in coils

Discussion in 'General Electronics Chat' started by crazybuoy, Aug 7, 2016.

1. ### crazybuoy Thread Starter Active Member

Sep 19, 2010
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There is set of coils in 2 different way (Fig 1 & 2). For example, the resistance of one coil is 3 Ohm as shown in image. Please tell me the resistance in following way:

Resistance between 1 & 2 in Fig 1 - ??
Resistance between 1 & 3 in Fig 1 - ??

Resistance between 1 & 2 in Fig 2 - ??
Resistance between 1 & 3 in Fig 2 - ??

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2. ### Alec_t AAC Fanatic!

Sep 17, 2013
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If this is a Homework or examination question, post your best effort at answering.

3. ### SLK001 Senior Member

Nov 29, 2011
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Try using simultaneous equations to solve your problem.

4. ### crazybuoy Thread Starter Active Member

Sep 19, 2010
77
0
It is not a homework or exam question. I have a stepper motor, I just want to know its winding setting. Please tell me the above resistances.

5. ### AlbertHall AAC Fanatic!

Jun 4, 2014
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Resistance between 1 & 2 in Fig 1 - 6 Ohms
Resistance between 1 & 3 in Fig 1 - 6 Ohms

Resistance between 1 & 2 in Fig 2 - 2.4 Ohms
Resistance between 1 & 3 in Fig 2 - 3.6 Ohms

Edit: Assuming the other pins are not connected

6. ### crazybuoy Thread Starter Active Member

Sep 19, 2010
77
0
Yes, all points (pins) in both figures are open. Please tell me how you calculate resistance in Fig-2?

Thanks

7. ### blocco a spirale AAC Fanatic!

Jun 18, 2008
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What is the make and model of this "stepper motor"?

8. ### AlbertHall AAC Fanatic!

Jun 4, 2014
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Fig 2, pins 1 to 2 looks like this:

Some simple series and parallel resistor calculations give the resistance between 1 and 2. You can do a similar diagram and calculations for 1 to 3.