![]() ![]() ![]() Most likely, you are viewing using Dropbox website or another limited browser environment. The webpage is not working since JavaScript is not enabled. This setup is frequently used in strain gauge and resistance thermometer measurements, as it is usually faster to read a voltage level off a meter than to adjust a resistance to zero the voltage. Very small changes in R x disrupt the balance and are readily detected.Īlternatively, if R 1, R 2, and R 3 are known, but R 2 is not adjustable, the voltage difference across or current flow through the meter can be used to calculate the value of R x, using Kirchhoff's circuit laws (also known as Kirchhoff's rules). ![]() Therefore, if R 1, R 2 and R 3 are known to high precision, then R x can be measured to high precision. R 2 is varied until there is no current through the galvanometer, which then reads zero.ĭetecting zero current with a galvanometer can be done to extremely high accuracy. If the bridge is unbalanced, the direction of the current indicates whether R 2 is too high or too low. If the ratio of the two resistances in the known leg (R 2/R 1) is equal to the ratio of the two in the unknown leg (R x/R 3), then the voltage between the two midpoints ( B and D) will be zero and no current will flow through the galvanometer e o. In the figure, Rx is the unknown resistance to be measured R 1, R 2 and R 3 are resistors of known resistance and the resistance of R 2 is adjustable. Wheatstone Bridge Analysis and Calculator If the ratio of the two resistances Rb / Ra is equal to the ratio of. Related Resources: Wheatstone bridge Wheatstone Bridge Analysis and Calculator The Wheatstone bridge network consists of four resistors Ra, Rb, Rc and Rx interconnected. ![]()
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