NATURE
Wednesday 4 July 2012
Wednesday 20 June 2012
Notes By Aji Paul
June 2012
Lab work series:-
MeterBridge
A network of resistors which can be used to (for example)
measure resistance. Electric current is divided into two resistor arms, A and B
and rejoined at the other end to continue the flow. A connection point X is
made along the arm A, and another point Y on arm B. A voltmeter is connected
between X and Y. This kind of circuit is called a Bridge (invented by Prof
Wheatstone of London , England ). When the meter indicates
zero current between X and Y it implies that the potential (voltage) at X is
the same as at Y, which means the ratio of the resistances AX to XB is the same
as the ratio of resistances AY to YB, independent of the voltage supply. This
circuit can be used to measure currents and voltages also.
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