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I know that telephone exchanges use a positive earth.
I don't know why, perhaps it's because n-type devices can switch the high side but I doubt it because it was invented before semiconductors.
Please post a referance. I find this very difficult to believe.If positive is used and negative is grounded, all the external copper wire used even now would get eaten off due to electrolytic action of atmosphere, grond at -ve and wire at positive.
This aspect was elaborated in Telephony by Atkinsin and also in articles of Lekurt demodulator. Lenkurt is a company of US in telecom those days.
- remember, these are the same people who invented the decibel.
Don't see IN the battery. See the case an electroplating set up using a battery. the metal transfer takes place from positive connected metal to the negative connected object.Please post a referance. I find this very difficult to believe.
Some old cars had a positive earth and it caused a huge number of corrosion problems, now all cars are negative earth, it's less of a problem.
I would have thought that corrosion would be more of a problem in exchanges which are positive earth.
If I remember my electrochemistry correctly, in a battery, the anode is always the part which gets corroded.
I know. But we just need to accept that duffy is rabid about the decibel and no amount of rational discussion will change his mind.Oh no, not decibels again...
Thanks,Sarma.You finally cracked it.
Yes you're right, I got it backwards.Don't see IN the battery. See the case an electroplating set up using a battery. the metal transfer takes place from positive connected metal to the negative connected object.
this very thing happens in the telecom external plant that used consist of lots of external copper wires. the atmosphere between ground and the wire would behave like electrolyte. slowly the wire were eaten away by electrolytic process.
Yes you're right, I got it backwards.
But from what you're said, a positive earth would increase the corrosion. Everything connected to the positive side of the battery would get corroded more. This would mean all metal parts of the building and enclosures in the installation would be more prone to corrosion than if a negative earth system were used.
it is to be analyzed. i did not delve in to the automobile subject. but there were some vehicles with positive ground also. but the over time the -ve ground be came more prevalent.Why is negative earth used for cars then?