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LAWS, KIRCHOFF'S

Text: These are two in number: First Law: The sum of the currents flowing to a point, in any electrical circuit, is equal to the sum of the currents flowing away from that point. Second Law: In any closed electrical circuit, the sum of the impressed electromotive forces (q.v.) will equal the sum of the voltage drops. This statement requires modification, in so far as "addition" of voltages is concerned. Voltages are added provided that they are in the same direction, but must be subtracted if in opposite directions. These two laws depend on Ohm's Law (q.v.) and constitute a further application of that law to more complicated electrical circuits. In addition to simple electrical circuits, conductors may be connected in various complicated networks, all of which come under the heading of divided circuits. By means of Kirchoff's Laws, the current in any part of a divided circuit may be found, if the resistances of the various parts, and the electromotive forces are given

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Source: 190

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