Current Electricity and Electrical InstrumentHard
Question
The current through the ammeter shown in figure is 1 A. If each of the 4Ω resistor is replaced by 2Ω resistor, the current in circuit will become nearly :
Options
A.10/9 A
B.5/4 A
C.9/8 A
D.5/8 A
Solution
Req = 2 + 
+ RA = 9 + RA
I =
⇒ 1 = 
⇒ RA = 1Ω
if 4Ω replace by 2Ω resistance then
Req = 2 +
+ 1 = 9Ω
I =
amp
+ RA = 9 + RA I =
⇒ 1 = ⇒ RA = 1Ωif 4Ω replace by 2Ω resistance then
Req = 2 +
+ 1 = 9Ω I =
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