Elementary Lessons in Electricity Magnetism Microform
Elementary Lessons in Electricity Magnetism Microform
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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.
What to read after Elementary Lessons in Electricity Magnetism Microform?
You can find similar books in the "Read Also" column, or choose other free books by Silvanus Phillips Thompson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
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.
What to read after Elementary Lessons in Electricity Magnetism Microform?
You can find similar books in the "Read Also" column, or choose other free books by Silvanus Phillips Thompson to read onlineMoreLess
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