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Can someone explain to me why one circuit diagram variant has more contacts?

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Hello, These two controllers are automatic star-delta circuits. As far as I can see, they do exactly the same thing. Why does one version have 7 switching points and the other 5? I don't see any advantages of the "7" controller over the other… (By switching points, I mean all the contacts necessary for controlling…

Right-fist rule?

ByEinstNewt142

If the thumb points in the technical current direction (i.e., toward the negative pole), I know the direction of the magnetic field lines based on the direction of the curled fingers. Does the thumb then always point toward the north pole? So how do I know where the magnetic poles are?

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YBCO123
YBCO123
2 years ago

“Brute Force”: Place stitches and knot equations to Kirchhoff.

Or you convert the branches between the nodes A-C and C-B by equivalent sources to make the external current sources Ia, Ib, Ic equivalent voltage sources. These are one, two steps you can count in your head when you make sketches.

Step-1: Recharging external currents

Schtitt-2: Uq2, R2 convert into a power source:

Shtitt-3: Collecting currents

Step 4: Converting the current sources into voltage sources

In the end, the circuit is characterized by:

For the nodes A, B, C, D, there is no difference with respect to the potentials set, since there are respective substitute sources equivalent to the original circuit between them.

Then you realize that the current in this circle

I4=I1=60V/16Ohm=3,75A

is -> the other streams you get easily and are ready:

I2=3,75A-6A=-2,25A

I3=8A-3,75A = 4,25A

.

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