current electricity
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#20730

## current electricity 3 Years, 2 Months ago

A milliammeter of range 10mA & resistance 9Ω is joined in a circuit as shown in the fig. The meter gives full scale deflection for current I when A & B are used as its terminals , i.e., current enters at A & leaves at B (C left isolated).The value of I is a) 100mA b) 900mA c) 1A d) 1.1A

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#77095

## Re: current electricity 2 Years, 10 Months ago

9 and 0.9 are in series w.r.to A and B and 0.1 is in parallel to this series combination. The total current is divided between these two branches in which one has total resistance as 9.9 and other has 0.1. Current I is divided into 10 mA in one branch and I-10 mA in other . SO 9.9 x 10 mA =( I -10 mA ) X 0.1. . Calclate I which will be in mA

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#77107

## Re: current electricity 2 Years, 10 Months ago

i thnk so answer is 100 mA wts d answer....? i solved it ..... tl me d ans

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#95406

## Re: current electricity 2 Years, 9 Months ago

0.1 mili ampere.....

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#95458

## Re: current electricity 2 Years, 9 Months ago

ans is coming 1A......@sourabh, plss give the right answer.........as soon as possible..

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#96549

## Re: current electricity 2 Years, 8 Months ago

Dear...

Question is very simple

..

See  specification of ammerter is  9 ohm and 10 mA

That means it can have maximum current 10 mA with it

So from I which enters through A ...10 mA will goes through Ammeter and then 0.9 ohm resistance and finallt leave through terminal B

Also the net current (I-10) will pass through resistance 0.1 ohm and leave from B

SO final current entering A is I  and leaving b is (I-10)+10

So The potential accross AB will be equal to potential accros terminal of Ammeter and accross resistance 0.9 ohm

So aply equation

9(10mA) + 0.9(10mA)  = (I-10)mA ( 0.1)

99  = (0.1* I - 1 )

so  0.1*I = 100

or I = 1000 mA

or I = 1 A

Note : for furthure doutb ask !

Good wishes

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Yagya Dutt Mishra
Study Doubt Expert of Entrance Corner
www.entrancecorner.com

Student of :Indian Institute Of Information Technology.Allahabad
Branch :ECE

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