Question

Physics question, explain

1. Does the sensitivity of the galvanometer be a limiting factor in a Wheatstone bridge experiment? If so, Under what conditions?

2. Compare the resistance from the Wheatstone bridge measurement and the direct measurement from the multimeter. Do they agree? Include the error analysis in your comparison.

use this EXAMPLE: Wheatstone bridge measurement av. 17.88 ohm/cm and direct measurement of the resistance with the multimeter is 19.5 ohm/cm +_ 0.1

Answer 1

1) As Wheatstone bridge uses a null measurement, (V_AB = 0), the galvanometer does not have to be calibrated. The Wheatstone bridge is a null measurement device for calculating resistance by balancing potential drops in a circuit. ... With no current running through the galvanometer, it has no effect on the rest of the circuit. It means sensitivity of galvanometer is not a limiting factorr.

2) From the given readins, measured resistances are not same

They have a percentage error of around

(17. 88 - 19.5 / 19.5) * 100 = 8.307 %