Electronics - Parallel Circuits - Discussion

I=v/r so I=48/1*10^3
so i=0.48
but here ammeter shows the value of 0.053
so here we have to change the value of resistance.

But .48 current is flowin only thru R1 na ?

0.053 is the current total through r2, r3 and r4 as branch current total. So I think r1 should be of value 333.33 0hm.

Can any one give the correct explanation?

Given total power=9.408
Power of r1=48/1*1000=.48mW
r2=48/2*1000=.24mW
r3=48/3*1000=.16mW
r4=48/4*1000=.12mW

Total power = 1W
But the total power given=9.408W.
ie, one resistor is wrong value.
................................................................

0.012A is current through R4
I R4= 48/4*1000 = .012A

So R4 is correct value
.................................................................

0.053 is the current total through r2, r3 and r4 as branch current total.
.........................................................................

We know that current through R4=.012

I (R2+R3) = V/(R2*R3/R2+R3)

=48/(2*3/2+3)1000
=48/(6/5)1000
=48/1200
=.04

Then I(R2+R3+R4)= .04+.012 = .052

So that R2,R3,R4 are correct.

i.e. R1 is wrong

P = V*I .... I = P/V = 9.408/48 = 0.196A (Total Current)
Current on R1 = 0.196 - 0.052 = 0.144A
R1 = 48V/0.144A = 333.33 Ohm (Should be the correct value of R1)

Circuit itself wrong. voltmeter is connected in series with circuit no current flows.

@ H@R you are correct!

@ vinoth: that's a wattmeter..not a voltmeter...

P = VxIt
It = P/V = 9.408/48 = 0.196A (Total Current)

IR4 = 0.012 A (Given)

R4 = 48/0.012 = 4000 = 4K R4 is correct

IR3 = V/R3 = 48/3000 = 0.016A
IR2 = V/R2 = 48/2000 = 0.024A
IR1 = V/R1 = 48/1000 = 0.048A

IR3 = (I3-I4)
I3 = (IR3+I4)
I3 = (0.016+0.012)=0.028A

R3 = V/(I3-I4) = 48/(0.028-0.012) = 3000 = 3K R3 is correct

R2 = V/(I2-I3) = 48/(0.052-0.028) = 2000 = 2K R2 is also correct

R1 = V/(It-I2) = 48/(0.196-0.052) = 333.33ohms which is notcorrect

since R1=1000ohms = 1k from the given circuit