What is the differance between negative dc voltage and
positive dc voltage because some circuit uses -24,-5,-12,-
15,volt dc supply
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These +ve and -ve supply are much more Important in power plants and oil and gas refinery.. This is because the energy level of both. +ve supply have much more energy than -ve supply. So normaly we grounded the +ve supply and -ve supply is used for supply. When we connect the +ve supply to supply this will cause produce some fire when some short connection occur in the equipments. So these fire will cause to explosion of oil and gas plants. For this reason we connect the -ve supply to the equipments.
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