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Why negative earth and not positive earth on a vehicle?

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2011-01-10 00:16:12
2011-01-10 00:16:12
Standardization

The electrical term "earth" or "ground" is a connection that runs through the entire electrical system. It may or may not be connected literally to the soil. When a system is "negative earth", it means the electrical earth has a negative polarity. Power can then be run back and forth using only one wire carrying the positive polarity. Similarly, electrical signals need only one wire. At the destination, the circuit is completed by connecting the "negative" terminal to earth or ground.

Until the 70s, cars were built with either a positive or negative earth, with popular British vehicles being among the last to be built with positive earth. Negative earth was adopted globally by automobile manufacturers for the sake of standardization. It was the introduction of radios in automobiles that may have seen negative earth automobiles being favoured. It was also thought positive earth vehicles rusted quicker.

The US telephone system also uses a positive ground, after starting out with negative ground. However, the trolley cars in Atlanta, Georgia were causing electrical induction interference, which led to the phone cables literally falling apart. Every kind of solution was tried, but they all failed, until as a last resort the phone company flipped the polarity, and it has stayed this way till the present day.

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Related Questions


Positive to positive, negative to negative if you are asking about installing one battery in a vehicle.

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On a vehicle the red is positive (+) and the black is negative (-). If they are not color coded the cable connected to the starter is positive and the cable connected to the engine or chassis is negative.

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a multiple, as follows:positive * positive = positivepositive * negative = negativenegative * negative = positivemore than 2 numbers:positive * positive * positive = positivepositive * positive * negative = negativepositive * negative * negative = positivenegative * negative * negative = negativeand so on...also, (any number) * 0 = 0

A negative divided by a positive is negative. A negative divided by a negative is positive. A positive divided by a positive is positive. A positive divided by a negative is negative.

a negative x a negative= a positive, a positive x a positive= a positive, a negative x a positive= a negative, and a positive x a negative= a negative. Same thing with division. a negative divided by a negative= a positive, a positive divided by a positive= a positive, a negative divided by a positive= a negative, and a positive divided by a negative is a negative. U see?

My vehicle is a 1997 Ford Fiesta. Is it negative-ground or is positive-ground?

positive and a positive is a positive negative and a negative is a positive to answer your question: positive and a negative is a negative.

it is negative. negative/negative = positive. negative/positive = negative

Earth has a positive and negative magnetic region.

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negative times negative = positive positive times positive = positive negative times positive = negative positive times negative = negative

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positive 49 Because a negative times a negative is a positive. -7*-7=49. positive * positive = positive negative * negative= positive positive * negative = Negative

If you are subtracting the negative from the positive, the answer will be positive. If you are subtracting the positive from the negative, the answer will be negative.

positive X positive = positive positive X negative = negative negative X positive = negative negative X negative = positive

The quotient of two positive integers will be positive. A positive divided by a positive is positive. A positive divided by a negative is negative. A negative divided by a positive is negative. A negative divided by a negative is positive.

6 + (-1) positive and negative will equal negative. so it's 6-1 that would equal 5. positive and positive= positive positive negative= negative negative negative = positive negative positive= negative


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