单词	potentiometer
释义	potentiometer 1 See voltage divider. 2 An instrument for measuring, comparing, or dividing small potential differences. A typical example of its use is the measurement of the e.m.f. ( E1 ) of a cell by comparing it with the e.m.f. ( E2 ) of a standard cell. In this case a circuit is set up as illustrated, in which AB is a wire of uniform resistance and S is a sliding contact onto this wire. An accumulator X maintains a steady current through the wire. To measure the e.m.f. of a cell C, it is connected up as shown in the diagram and the sliding contact moved until the e.m.f. of C exactly balances the p.d. from the accumulator, as indicated by a zero reading on the galvanometer G. If the length AS is then l1 , the value of E1 is given by E1/E2 = l1/l2 , where l2 is the length AS when the standard cell is used as the cell C. Potentiometer
随便看	secondary emission secondary winding secular magnetic variation sedimentation Seebeck effect Seger cones Segrè plot seismic waves seismograph seismology selection rules selectron selenium cell selenology self inductance self-energy self-exciting generator self-organization self-similarity semiclassical approximation semiconductor semiconductor diode semiconductor laser semipermeable membrane series

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