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	infrared radiation infrasound insolation instantaneous value insulator integer quantum Hall effect integral calculus integrand integrated circuit integration intensity intensive variable interaction intercalation cell interference interferometer intermediate coupling intermediate frequency intermediate neutron intermediate vector boson intermetallic compound intermolecular forces internal conversion internal energy internal resistance

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