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प्रश्न
A moving coil galvanometer of resistance 55 Ω produces a full scale deflection for a current of 250 mA. How will you convert it into an ammeter with a range of 0 - 3A?
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उत्तर
Galvanometer - Ammeter
and shunt is parallel to galvanometer
Rs(I - ig) = igG
`"R"_"s" = (250 xx 10^-3 xx 55)/(3 - 250 xx 10^-3)`
`"R"_"s" = 13.75/2.75`
Rs = 5 Ω
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संबंधित प्रश्न
Draw a labelled diagram of a moving coil galvanometer. Describe briefly its principle and working.
The fraction of the total current passing through the galvanometer is ............ .
a) `S/(S+G)`
b) `G/(S+G)`
c) `(S+G)/G`
d) `(S+G)/S`
Figure shows two circuits each having a galvanometer and a battery of 3V.
When the galvanometers in each arrangement do not show any deflection, obtain the ratio R1/R2.
Outline the necessary steps to convert a galvanometer of resistance RG into an ammeter of a given range ?
Define the term ‘current sensitivity’ of a moving coil galvanometer.
The conversion of a moving coil galvanometer into a voltmeter is done by ______.
A voltmeter of variable ranges 3 V, 15 V, 150 V is to be designed by connecting resistances R1, R2, R3 in series with a galvanometer of resistance G = 20 Ω, as shown in Fig. The galvanometer gives full pass through its coil for 1 mA current i.e. "gives full pass through it's coil for 1 mA current". Then, the resistances R1, R2 and R3 (in kilo ohms) should be, respectively:
A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10-divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 volt, the resistance in ohms needed to be connected in series with the coil will be ______.
To convert a moving coil galvanometer into an ammeter we need to connect a ______.
