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## Homework Statement

a 3.0 ohm resistor an unkown resistor r and two ammeters a1 and a2 are connected with a 12 volt source ammeter a2 reads a current of 5.0 amperes

1) detemine the equivalent resistance of the circuit

2) caculate the current measure of ammeter a 1

3) caculate the resistance of the unknown resistor r

## Homework Equations

v= 12 v

a2 = 5.0 a

a1 = ?

r1 = 3.0 ohm

r2 =?

this is a parallel circuit so

do i use v/a to find equivalent resistance?

for current do i use v/r to find a?

and for the resistor is this equation right 1/req = 1/r1 + 1/r2

## The Attempt at a Solution

i got 2.4 ohm for the equivalent resistance and 4 a for the current dont know if it right