# Current across a resistor

## Homework Statement

Number 15
[PLAIN]http://lookpic.com/d2/i2/386/kFYE2mOH.jpeg [Broken]
http://lookpic.com/d2/i2/386/kFYE2mOH.jpeg [Broken]

## Homework Equations

Rs=R1+R2+R3
Rpar=1/r1+1/r2+1/r3
I=V/R

## The Attempt at a Solution

1/(1/5+1/10+1/5)=2
Rtotal=7
I=21/7
I=3

I don't know what else to do to solve this problem. Any help would be greatly appreciated.

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berkeman
Mentor

## Homework Statement

Number 15
[PLAIN]http://lookpic.com/d2/i2/386/kFYE2mOH.jpeg [Broken]
http://lookpic.com/d2/i2/386/kFYE2mOH.jpeg [Broken]

## Homework Equations

Rs=R1+R2+R3
Rpar=1/r1+1/r2+1/r3
I=V/R

## The Attempt at a Solution

1/(1/5+1/10+1/5)=2
Rtotal=7
I=21/7
I=3

I don't know what else to do to solve this problem. Any help would be greatly appreciated.
Welcome to the PF.

That's a good start. Once yuu figure out the parallel resistance of those 3 resistors, use the voltage divider equation to tell you what the voltage is across the 3 parallel resistors. that will then give you the current through that individual 10 Ohm resistor leg.

And the current is "through" the resistor. Voltages are across resistors, and currents flow through resistors.

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vela
Staff Emeritus