# [PEDA] AW: Copper Calculations

```>From this point, look how easy physics can be, if you are using the metric
system.```
```
Georg

-----Urspr ngliche Nachricht-----
Von: Brooks,Bill [mailto:[EMAIL PROTECTED]]
Gesendet: Montag, 19. November 2001 21:58
An: 'Protel EDA Forum'
Betreff: Re: [PEDA] Copper Calculations

Hi Rene,

I believe the way the story (legend) goes is:

The British housing industry used to make copper shingles for roofing...
they were 1 foot by 1 foot square and had a weight 1 oz. ... I'm told that's
where the measurement technique was invented... This of course, yields the
familiar 1.4 mils thick copper we all know and love.... That copper sheet
material was then laminated or applied to an insulator backing and the PCB
was born.. :) (don't ya love legends)
Can't remember where I heard it... but it made sense... Might as well retell
it...

- Bill Brooks

-----Original Message-----
From: Rene Tschaggelar [mailto:[EMAIL PROTECTED]]
Sent: Monday, November 19, 2001 12:05 PM
To: Protel EDA Forum
Subject: Re: [PEDA] Copper Calculations

This unit 'ounces of copper', does it apply to
1)square foot ?
2)square yard ?
3)square meter ?

European thicknesses are 35, 70, 105, 150, 200 and 300 micrometer.
I just wondered how they relate.

One ounce is 28 grams, isn't it ?

Rene

Stephen Smith wrote:
>
> Does anyone know a simple way of calculating copper track size (in, mm),
> when you know the amount of copper (in, ounces), and the current flow
> (in, Amps)??
> I've never had to do any high current circuits before, so any help much
> appreciated.

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