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direct current |
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direct currentElectric 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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| For EMFs to penetrate the body, the coils must carry a pulsing electric current, he explains--not the simpler direct currents associated with electrode-generated fields. The electrical field creates stable secondary magnetic fields around direct currents and alternating or reversing polarity around faradic currents. Some investigators[1-4] described the use of low intensity direct currents for wound healing. |
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