Elementary Lessons in Electricity Magnetism Microform
Elementary Lessons in Electricity Magnetism Microform
Silvanus Phillips Thompson
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EXAMPLE. Suppose we had a wire, whose resistance we knew to be between 46 and 47 ohms, and wished to measure the fraction of an ohm, we should insert it at D, and make A 100 ohms and C 10 ohms ; in that case D would be balanced by a resistance in B 10 times as great as the wire D. If, on trial, this be found to be 464 ohms we know that D = 464 x io -~ 100 = 46*4 ohms. In practice the bridge is seldom or never made in the lozenge-shape of the diagrams. The resistance-box of Fig. 132 is, in itsel...f, a complete "bridge, " the appropriate connections being made by screws at various points. In using the bridge the battery circuit should always be completed by depressing the key K x before the key K 2 of the galvanometer circuit is depressed, in order to avoid the sudden violent " throw " of the galvanometer needle, which occurs on closing circuit in consequence of self-induction (Art. 404). 36O. Measurement of Electromotive-Force. There being no easy absolute method of measuring electromotive-forces, they are usually measured relatively -, by comparison with the electromotive-force of a standard cell, such as that of Daniell (Art.
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