![]() The voltage drop in the DC voltage source is shown below. While this is the ideal case, in the practical world, the source has some series impedance that causes the source voltage to drop as the outgoing current increases. These are – Voltage Sources and Current Sources.ĭC Voltage Sources are the ones that have constant DC voltage irrespective of the current drawn. The followings are the DC wire color codes for the grounded systems under the US National Electrical code Function US National Electrical recommended code Label Color Protective ground PG Bare, Green, or Green-Yellow Two-wire ungrounded DC system Positive L+ No recommendation (Red) Negative L- No recommendation (Black) Two-wire grounded DC system Positive (Negative grounded) circuit L+ Red Negative (Negative grounded) circuit N White Positive (Positive grounded) circuit N White Negative (Positive grounded) circuit L- Black Three-wire earthed DC system Positive L+ Red Mid-wire N White Negative L- Black Type of DC SourcesĭC sources are the ones from which we provide DC power to an electrical or electronic circuit. US National Electrical code no wire color codes ungrounded system for safety reasons. F unction IEC Standard Label Color Protective earth PE Green-Yellow Two-wire unearthed DC system Positive L+ Brown Negative L- Grey Two-wire earthed DC system Positive (Negative earthed) circuit L+ Brown Negative (Negative earthed) circuit M Blue Positive (Positive earthed) circuit M Blue Negative (Positive earthed) circuit L- Grey Three-wire earthed DC system Positive L+ Brown Mid-wire M Blue Negative L- Grey US DC Power Circuit Wire Color Codes The following table shows the IEC Standards for DC voltage cables. IEC (International Electrotechnical Commission) provides a standard for wiring codes. ![]() The Unicode character-U+2393 “⎓” is used for the DC applications. Thus, the component never charges and can rather cause a fatal accident if AC voltage is applied across its terminals. In the case of AC voltage, the charges flow from the source to the charging component in the positive half-cycle while the opposite happens in the negative half-cycle as the component discharges back to the source. The capacitor acts as a storage of charge. DC voltage produces a unidirectional current that flows from the source to the circuit and hence the electrical charges simply move from the source to the charging battery or capacitor. AC voltage can’t be used for charging purposes. Apart from that, DC voltage bulbs and fans are used as a backup in case of a power cut.ĭC voltage is ideal for charging rechargeable batteries and capacitors. In addition to that, DC voltage is used in industries and power plants to charge capacitors, energize field circuits, and control certain equipment. Today, DC voltage is largely used in small electronic components. A plot of direct current/voltage against time It is relatively easy to analyze mathematically and to design its components. ![]() This is because, in the case of DC voltage, there is no concept of frequency, phase, vector, or phasor analysis. In the case of pulsating DC, there is an alternating waveform but the average value of the voltage is either positive or negative but not zero.ĭC voltage is simple as compared to its AC counterpart. Charges flow unidirectionally from the source to the load or the circuit only. However, this is not the case with DC voltage. So the electrical charges flow from the source to the load in the first half cycle and from the load to the source in the negative half cycle. ![]() The average value in one cycle being equal to zero means the net voltage in a positive half cycle is equal in magnitude in the negative half cycle. This is because although these waveforms are alternating apparently, their average value in one cycle is not equal to zero.Ī voltage can be called an Alternating Current(AC) Voltage if and only if it alternates every half cycle and has an average value equal to zero in one complete cycle. However, in some electronic circuits, there are components that generate an alternating voltage waveform but those are called pulsating DC. It is the type of voltage that we get from batteries, DC generators, and other sources like sensors and transducers.ĭC voltages unlike AC don’t have a frequency which means they don’t alter every half-cycle. Last Updated on Decemby Electricalvolt What is DC Voltage?ĭC voltage stands for Direct current voltage.
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