Direct Current Circuits

If the independent sources in a circuit are constant sources, such as batteries, all the currents and voltages remain constant and the circuit reaches its steady state. In this case, we say that the circuit is in a DC steady state. 

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Power, P, defiaed as the rate at which work is performed, is expressed ia terms of energy divided by time and is most commonly given in units of horsepower, as for the power suppHed by mechanical devices such as diesel engines, or in the SI units of watts, especially when measuring electrical power. One horsepower is equivalent to the amount of power needed to lift 33,000 pounds (14,982 kg) one foot (30.5 cm) in one minute. One watt is equivalent to the power required to perform one joule of work per second. In a simple direct-current circuit where potential is represented by E ... 

The parameter impedance in electrical alternating-current circuits is the equivalent of resistance in direct-current circuits. If a linear and time-invariant system, L, is considered, then it can be said that ... 

Normally one considers transformers for use only in alternating current applications because of the saturation of the core material when used in direct current circuits. To support a steady dc voltage across either the primary or secondary windings requires a constantly changing flux in the core material,... 

Rectifiers. The classic apphcation for a diode was to act as a one-vray valve for electric current. Such a property makes diodes ideal for use in converting alternating current into direct-current circuits or circuits in which the current flows in only one direction. In feet, the devices were originally called rectifiers before the term diode was created to describe the... 

Direct-current circuits, 26,27 Direct-current plasma source, 258-259... 

Electrical Coinpoiieiils and Circuits 26 2A Direct-Current Circuits and Measurements 26 2B Aiternating Current Circuits 32 2C Semiconductors and Semiconductor. Devices 43... 

The oil film breakdown ratio is measured by a direct current circuit comprising a resistor, capacitor, shaft, and seal. The charging characteristic of the capacitor differs from cases where the shaft is perfectly contacted or occasionally contacted with the seal lip. Thereupon, the time elapsed when the voltage of the capacitor reached a certain threshold value are added to t and t respectively, the oil film breakdown ratio e is defined by equation 2. ... 

Electrical Engineering 235 6.0 DIRECT CURRENT CIRCUIT ANALYSIS... 

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