4.1. Basic principles
            4.1.1. Electrical principles
4.1.1.1. Wheatstone bridge

Wheatstone bridge

Purpose

Used to increase sensitivity

Setup

Consists of:

Usage

Calibration involves adjusting the variable until it produces null deflection of the galvanometer
* i.e. R1/R2 = R3/R4
* --> no current through galvanometer

Often designed so that when pressure changes, resistance of 2 resistors on opposite sides will increase and the resistance of the other 2 will decrease
--> deflection produced in galvanometer will be maximised
* i.e. higher sensitivity

Keywords:  Wheatstone bridge
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Created20050601
Reviewed20050601


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