By varying the value of one of the known resistances, the bridge can be made to balance for any value of unknown resistance, which can then be calculated from the values of the other resistors. In theory, if one arm of an originally balanced equal-arm Wheatstone Bridge is changed from R to R + ∆R, the bridge voltage will be given by:

V0 = (Vs/4) x (∆R/R) = (Vs/4R) x ∆R

Therefore, when plotting the graph V0 against ∆R, the values ∆R around less than about 10SÙ we would expect a linea

Using the graph to determine the unknown resistance: Rx = 6.7SÙ

∆R

Some common words found in the essay are:
Charles Wheatstone, Wheatstone Bridge, Bridge INTRODUCTION, wheatstone bridge, unknown resistance,
Approximate Word count = 1209
Approximate Pages = 5 (250 words per page double spaced)