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The bridge sensitivity will be maximum if and only if the bridge has all equal arms i,e P = Q = R = S. The maximum bridge sensitivity is,

SBmax = SvE / 4

Calculate maximum bridge sensitivity by using this simple sensitivity of wheatstone bridge calculator online.

Limitations of Wheatstone Bridge

Wheatstone bridge is not suitable for low and high resistance due to the following reasons:

• it can measure from few Ω to several MΩ
• upper limit is set by reducing the sensitivity to unbalance caused by resistance values
• upper limit can be extended by increasing emf that causes heat
• inaccuracy due to leakage out of insulation
• contact resistance presents a source of uncertainty that is difficult to overcome