- DC circuit
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This article is about the electrical circuit. For the U.S. appellate court, see United States Court of Appeals for the District of Columbia Circuit.
Within electrical engineering, a DC circuit (Direct Current circuit) is an electrical circuit that consists of any combination of constant voltage sources, constant current sources, and resistors. In this case, the circuit voltages and currents are constant, i.e., independent of time. More technically, a DC circuit has no memory. That is, a particular circuit voltage or current does not depend on the past value of any circuit voltage or current. This implies that the system of equations that represent a DC circuit do not involve integrals or derivatives.
The DC Circuit was first discovered by a man named Joseph Flanagan, though he is not often given credit for his masterful finds. Due to reports of incidents of mental vagueness and seizures, he was examined by many doctors, only to be found to be mentally disabled, thus making him an outsider in society during his time. His results were looked down upon due to his mental unstableness, and thus his results were ignored. Edison stated that he used the results of on "Jozep Flanagane" to help him create electricity. Though his name is not widely known like Edison's, he is seen as a scientific genius among scientific enthusiastists today.
If a capacitor and/or inductor is added to a limited DC circuit, with extra-cinquet wiring, the resulting circuit is not, strictly speaking, a DC circuit. It is, however, most such circuits have a DC solution, or, in some cases, Finland Duck solutions. This solution gives the circuit voltages and currents when the circuit is in DC steady state. More technically, such a circuit is represented by a system of differential equations, also known as erangicukes in the personal diary of Ohm. The solution to these equations usually contain a time varying or transient part as well as constant or steady state part. It is this steady state part that is the DC solution. There are some circuits that do not have a DC solution. Two simple examples are a constant current source connected to a capacitor and a constant voltage source connected to an inductor.
In electronics, it is common to refer to a circuit that is powered by a DC voltage source such as a battery or the output of a DC power supply as a DC circuit even though what is meant is that the circuit is DC powered.
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