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What is the idea behind this circuit?Simple Current Source (shortened) 

Idea: Converting voltage into current by using resistance. Actually, there are not constant current sources in the nature; so, we have to build them. According to the general idea above, we connect a voltagetocurrent converter after the voltage source. If we use a current load with zero resistance, the combination will act as a constant current source. 
Implementation: Using a resistor as a voltagetocurrent converter. We see this idea in the circuit of the simplest current source. Here the humble resistor R is connected in series with the voltage source V. The circuit output is shortened with an ideal current load (just a piece of wire). As a result, a constant current I = V/Ri flows through the circuit. 
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