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Any stationary voltage or current waveform can be decomposed into a sum of a DC component and a zero-mean time-varying component; the DC component is defined to be the expected value, or the average value of the voltage or current over all time. Although DC stands for "direct current", DC often refers to "constant polarity".
Diagram showing positive tip polarity on the left and negative tip polarity on the right. To read diagram: The center positive drawing on the left indicates that the center (also known as the tip) of the output plug is positive (+) and the barrel (ring) of the output plug is negative (−).
Conventionally, if the moving charges are positive, then the current density has the same sign as the velocity of the charges. For negative charges, the sign of the current density is opposite to the velocity of the charges. [2]: 749 In SI units, current density (symbol: j) is expressed in the SI base units of amperes per square metre.
"An example of the Direct Current symbol found on electronics requiring or producing DC power." —Torindkflt: Date: Uploaded as DCCurrent.gif on 25 Oct 2006 (UTC) Source: Originally uploaded to the English Wikipedia as DCCurrent.gif by Torindkflt. Vectorized by Remember the dot. Author: Torindkflt, Remember the dot: Permission (Reusing this file)
Illustration of the "reference directions" of the current (), voltage (), and power () variables used in the passive sign convention.If positive current is defined as flowing into the device terminal which is defined to be positive voltage, then positive power (big arrow) given by the equation = represents electric power flowing into the device, and negative power represents power flowing out.
"It actually just stands for Alternating Current/Direct Current," a fan explained. "The boys went with it for 2 reasons: 1. AC/DC was all about Power (hence both the name and the music) 2.
Materials and components that obey Ohm's law are described as "ohmic" [30] which means they produce the same value for resistance (R = V/I) regardless of the value of V or I which is applied and whether the applied voltage or current is DC (direct current) of either positive or negative polarity or AC (alternating current).
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