This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...resistance (r) is not accurately known, or if it is liable to alter through heating due to the passage of the current, then its equivalent value--may Ax be used instead in the formula, which will therefore become--where V=the voltage across the extremities of PQ. There is no objection to using a bank of incandescent ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...resistance (r) is not accurately known, or if it is liable to alter through heating due to the passage of the current, then its equivalent value--may Ax be used instead in the formula, which will therefore become--where V=the voltage across the extremities of PQ. There is no objection to using a bank of incandescent lamps for (r), since the resistance may vary if it likes with the different mean current strengths. It will be observed that if the resistance of A2 is appreciable, an amount of power may be absorbed in it which is comparable with that in PQ. In such cases the former must be deducted from the result as given by the above relation in order to obtain the true power absorbed in PQ alone. If (r) is accurately known we may dispense with Al and put (r) directly across the mains, then on placing a voltmeter (preferably an electrostatic one) across the mains as in the last instance, we may substitute the value of Al in the first formula, when we shall have (114) Measurement of Power in ThreePhase Alternating Current Circuits. Introduction.--The measurement of the electrical power absorbed in a 3-phase alternating current circuit might well at first sight appear somewhat complicated. In reality, however, it is very little more so than in the case of single-phase circuits and the actual extent to which it is, depends mainly on the nature of the circuit in which the measurement is being made. It has already been seen that the non-inductive Wattmeter forms the best means of obtaining the true power absorbed in a single-phase circuit, but with multiphase circuits usually, though not always, two such instruments are necessary. The object consequently of the present investigation is not only to state the methods of measuring, but also to prove the truth of the...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.