write down the decimal expansion of 17/8
Answers
Answer:
17 = 2.125
__
8
Ans. 2.125
Hope it helps.
Answer:
Given: A galvanometer of 100 resistance gives full scale deflection with 0.01A current
To find the resistance that should be connected convert it into an ammeter of range 10A
Solution:
Galvanometer is a very sensitive instrument therefore it cannot measure heavy currents. In order to convert a Galvanometer into an Ammeter, a very low shunt resistance is connected in parallel to Galvanometer. Value of shunt is so adjusted that most of the current passes through the shunt.
If resistance of galvanometer is R
g
and it gives full-scale deflection when current I
g
is passed through it. Then,
V=I
g
R
g
⟹V=0.01A×100Ω
⟹V=1V
Let a shunt of resistance (R
s
) is connected in parallel to galvanometer. If total current through the circuit is I.
I=10A=I
s
+I
g
V=I
s
R
s
=(I−I
g
)R
s
(I−I
g
)R
s
=I
g
R
g
(10−0.01)R
s
=100×0.01
⟹R
s
=0.1Ω
is the resistance that should be connected in parallel to convert it into an ammeter of range 10A