Calculating Current in a Basic Resistor Circuit

[CompEguy]

Homework Statement

In the pictured, the battery puts out 12 volts, R1 is 9 ohms, R2 is 6 ohms, and R3 is 5 ohms.

What current flows through resistor R1?

Please use only SI (metric) system units in your answer!

Homework Equations

R=V/I ?

The Attempt at a Solution

I am completely lost...

 

[kuruman]

Can you find the equivalent resistance of the circuit?