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- The sensitivity of a Moving Coil Galvanometer is defined as the ratio of the change in deflection of the galvanometer to the change in current. Therefore we write, Sensitivity = dθ/di.
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Apr 8, 2021 · The current sensitivity of a galvanometer is the deflection per unit current produced by the galvanometer. A high-sensitivity galvanometer can be used to measure very low values of currents....
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- Khan Academy India - English
The current sensitivity of the galvanometer is defined as the ratio of deflection produced in the galvanometer to the current flowing through it. Mathematically, the current sensitivity of the galvanometer is given as S i = θ / I = = n B A / k.
The current sensitivity of a galvanometer is defined as the deflection produced when unit current passes through the galvanometer. A galvanometer is said to be sensitive if it produces large deflection for a small current. In a galvanometer, I = (C/nBA) x θ. ∴ Current sensitivity θ/I = nBA/C … (1)
We can relate the arm deflection and amount of current by determining a galvanometer’s sensitivity, represented by 𝑆. The sensitivity equals 𝜃 divided by 𝐼. Thus, for a galvanometer with a low sensitivity, the arm will deflect less for a given current.
- Maxwell derived a theorem which states that for the maximum deflection of a
- I. INTRODUCTION
- 4 examined Ayrton and Perry's analysis and demonstrated that the simplicity of
- Maxwell and of Ayrton and Perry concerning what may be called
- II. SENSITIVITY OF THE MOVING-MAGNET GALVANOMETER
galvanometer connected to a given external circuit containing a given electro-motive force the ratio of galvanometer resistance to external resistance should be equal to the ratio of the diameter of the wire in the galvanometer coil (before insulation) to the diameter including the insulation. Ayrton and Perry later stated that the galvanometer res...
The question of the most suitable size of wire for the coil of a gal- vanometer, in order to secure a maximum sensitivity for certain definite conditions of use, arose during the development of the electric telegraph. Maxwell J investigated the case of a moving-magnet galvanometer used to measure the current in an external circuit of resistance R, ...
their result did not contradict Maxwell's sensitivity theorem, nor did it depend on the particular form of cross section of the coil, nor on the law governing the variation of the diameter of the wire from layer to layer, but solely upon a different assumption which Ayrton and Perry had made, namely, that the thickness of the insulation was in ever...
the working sensitivity of a galvanometer are theoretically correct, there is nevertheless a great deal of latitude in the choice of the resistance of the galvanometer, with only a relatively small resulting loss in sensitivity, and with some material advantages. The manner in which the user may take advantage of this fact will be indicated.8
There are various ways of expressing the sensitivity of a galvanom- eter, all of which ultimately relate to its current sensitivity; that is, its response (deflection) for unit current in its coil. There are cases, such as in the measurement of insulation resistance by the direct- deflection method, where the external resistance is so high that the...
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Mar 8, 2018 · To achieve $\frac {1}{4}$ Sensitivity, you must have $\frac {1}{4}$ deflection or $\frac {1}{4}$ of $I_{FSD}$. This means the total resistance of the shunt and galvanometer must be 25% of galvanometer resistance.
Define the current sensitivity of a galvanometer. Write its S.1. unit. Figure shows two circuits each having a galvanometer and a battery of \ ( 3 \mathrm {~V} \). When the galvanometers in...
