Used to increase sensitivity
Consists of:
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
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Created | 20050601 |
Reviewed | 20050601 |