# Harmonic average and electromagnetism

1. May 16, 2010

### Taturana

We know that a lot of electrical components associations are calculated using the harmonic average.

If we have parallel resistors we use the harmonic average. If we have serial capacitors we use the harmonic average too and so on...

But my question is: why the harmonic average? what does the harmonic average represents? why not any other type of average?

Could someone explain me that?

Thank you

2. May 17, 2010

### 0xDEADBEEF

If you have resistors you see that you simply add the conductance because you have two paths for the current, that is 1 divided by the resistance. Whenever you have to add the inverses of a quantity this behavior leads to the harmonic average.

3. May 17, 2010

### Dickfore

Actually, we don't have the harmonic average. We have n times less than the harmonic average, where n is the number of resistors in parallel.

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