Help understanding current source

1. The problem statement, all variables and given/known data

This is a really basic problem, just a closed circuit with a current source and a resistor. We are meant to give the voltage and the current across the resistor in terms of the current from the source and the resistance of the resistor. (From the diagram, express Vr and Ir in terms of I1 and R). I have never encountered a current source before and am having trouble learning to deal with it.

2. Relevant equations

Ohm’s law: V = IR
Kirchoff’s Laws: sum of voltages = 0, and current into a node = current out

3. The attempt at a solution

My thought was to say that I1 = Vs/Rs, so Vs = I1/Rs = Vr = Ir/R.
But then I don’t know how to solve these for Ir and Vr in terms of I1 and R.

Any help understanding the concept would be greatly appreciated! Thanks 🙂

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