Electric And Magnetic Measurements
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A distinct advantage of the method is that the standard cell is so used that at the moment of balance no current whatever is being drawn from it. Hence precise results uninfluenced by polarization can be obtained. Furthermore, at the instant of balance, the lead wires do not carry any current, so that errors due to potential drop or contact resistance do not occur.
92. A Resistance-box Potentiometer. The long wire of the simple potentiometer may be replaced by a pair of resistance boxes, in whi...ch case a greater degree of precision may be attained.
126 POTENTIAL DIFFERENCE [HI, 92 The circuit of Fig. 57 shows such an arrangement. The working battery WE is placed in series with two resistance boxes R! and R 2) each of 10, 000 ohms or more. The sum of R 1 and R 2 must be kept constant. A standard cell S with its poles opposed to the working battery is connected in series FIG. 57.
with a galvanometer across the terminals of R 2 . If the E. M. F. Of the standard cell is less than the potential drop along PP', some value of R 2 can be found for which the potential drop measured by iR z is just equal to the E.
What to read after Electric And Magnetic Measurements?
You can find similar books in the "Read Also" column, or choose other free books by Charles Marquis Smith to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
A distinct advantage of the method is that the standard cell is so used that at the moment of balance no current whatever is being drawn from it. Hence precise results uninfluenced by polarization can be obtained. Furthermore, at the instant of balance, the lead wires do not carry any current, so that errors due to potential drop or contact resistance do not occur.
92. A Resistance-box Potentiometer. The long wire of the simple potentiometer may be replaced by a pair of resistance boxes, in whi...ch case a greater degree of precision may be attained.
126 POTENTIAL DIFFERENCE [HI, 92 The circuit of Fig. 57 shows such an arrangement. The working battery WE is placed in series with two resistance boxes R! and R 2) each of 10, 000 ohms or more. The sum of R 1 and R 2 must be kept constant. A standard cell S with its poles opposed to the working battery is connected in series FIG. 57.
with a galvanometer across the terminals of R 2 . If the E. M. F. Of the standard cell is less than the potential drop along PP', some value of R 2 can be found for which the potential drop measured by iR z is just equal to the E.
What to read after Electric And Magnetic Measurements?
You can find similar books in the "Read Also" column, or choose other free books by Charles Marquis Smith to read onlineMoreLess
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