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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.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoAlot of vehicles built before 1950 were positive ground. I own a couple of 1940's era farm tractors that are 6 volt positive ground.
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Is the frame of the vehicle normally attached to the positive battery post?
No. That would short out and potentially cause a fire. The negative side will go to the frame or the body to ground.
If the mother has B positive blood and the father has O negative what would the child's blood type be?
B positive or negative or, O positive or negative.
Is human interaction of a earthworm positive or negative?
It can be positive or negative, but mostly negative because humans are the biggest predator of earthworms.
What cable do you take off a vehicle before you start welding?
Negative cable, usually black. For safety reasons, you should always remove negative cable first and positive second. Replace in reverse order, + first, - last.
What is the procedure of the baterry?
The vehicle battery's main purpose is to supply power for the starting system and to power some accessories when the engine is not running. The proper procedure for changing or installing a battery... remove the battery cable first from the negative battery terminal, then from the positive. Install opposite, attach the positive cable lead, then the negative.
How is the battery trminals hook up positive to positive or negative to positive?
Positive to positive, negative to negative if you are asking about installing one battery in a vehicle.
How do you tell if a car has a negative or positive system?
Post the year, make and model of the vehicle (in new question) and one of us can tell you if it is negative or positive ground.
Is the 1999 grand voyager is it a negative or positive ground?
Negative earth
Is a dodge stratus a positive grounded vehicle?
No, it is negative ground.
When did the t140 change from positive earth to negative earth?
in 1978 with the T140E
Which cable is positive and which is neg?
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.
Is earth on Toyota Corolla positive or negative?
poitive
Is a positive plus a negative make a positive or a negative?
Positive + Negative = Negative Negative + Negative = Positive Positive + Positive = Positive Negative + Positive = Negative
What is a negative - positive?
Negative * positive = negative Positive * positive = positive Negative * negative = positive
Are all cars negative earth?
No. A lot of cars in the 1960's had positive earth.
How is dividing integers similar to multiplying integers with the resulting sign?
The rules for the sign (positive or negative) of the result of a multiplication is the same as division. For multiplication: Positive * Positive --> Positive Positive * Negative --> Negative Negative * Positive --> Negative Negative * Negative --> Positive For division: Positive / Positive --> Positive Positive / Negative --> Negative Negative / Positive --> Negative Negative / Negative --> Positive
If a negative is divided by a positive is it negative?
Yes. Negative/negative = positive Postive/Positive = positive Negative/Positive - negative
