Answer to Question #216334 in Electrical Engineering for Fredy

Question #216334

How can we calculate the internal resistance, voltage out put due to unbalanced condition, current through galvanometer for unbalanced and smallest charge in resistance that can be detected of a wheatstone brigde given that Resistance 1=Resistance 2= varrying Resistance 3=Resistance 4=1000 ohms and a galvanometer can detect as low as 0.1 milliamperes?


1
Expert's answer
2021-07-13T03:10:06-0400

As all resistance given are equal connected in Wheatstone bridge

Therefore the condition of balance

"R_1*R_3= R_2*R_4" is satisfied

No current flows through galvanometer hence the internal resistance of galvanometer is infinite for this case.


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