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direct current
(redirected from Direct-current)

    Also found in: Medical, Encyclopedia, Wikipedia 0.07 sec.

direct current

Electric current in which the electrons (negative charge) flow in one direction, and that does not reverse its flow as alternating current does. The electricity produced by a battery is direct current. Electromagnets and electric trains use direct current.

If in one second one coulomb of electrons passes a given point, then the current flow is 1 amp DC.

A cathode ray oscilloscope (CRO) is used to display the waveforms that show the pattern of how voltage and current vary over a period of time. The waveforms for DC are straight lines, as the voltage and current do not vary over a period of time. If a resistor is connected in a circuit and measurements of voltage across the resistor and current flowing through it are taken over a period of time, there will be no change in the voltage and current over this period. A plot of voltage or current against time produces a straight line.



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? Mentioned in ? References in periodicals archive
 
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