It is an circuit that is used to find the value of the resistances. The main principle behind it is the balancing an circuit by means of varying an resistance on connected to an arm of the circuit.When the resistance become equal to the variable resistance no current flows thus we can find the value of the resistance.
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The correct term is the 'Wheatstone Bridge' or 'Wheatstone's Bridge', named in honour of its inventor.
It is one example of numerous other 'bridge circuits'. Wheatstone's Bridge is used to accurately measure values of resistance. I suggest that you check out WikiAnswer to see its circuit diagram, and explanation of how it is used.
The Rialto is a stone arch bridge.
The Carey Foster bridge works on the principle of the wheatstone bridge (potentiometer)which can be used to measure fractional resistance.
The "Richmond Bridge" London, England. The design is a stone arch bridge constructed of Portland stone, construction started 1774 and completed 1777.The "Richmond Bridge" Richmond, Tasmania. The original name was "Bigge's Bridge and was constructed of sandstone, construction started in 1823 and completed in 1825.
Bridges have been built since the stone age, it is impossible to say where or when the first one was built.
Can you give us some idea of the size of bridge you're referring to? Firstly, how long is it? If it's a suspension bridge do you include all the shore anchorages in the weight? What is it made from - stone, brick, steel, wood, for example? Is the whole of the bridge made from the same thing? What sort of load is it meant to carry?