please explain.

Well, the CCS, as its name implies, tries to keep constant the current wich flows

**thru** it what could be the voltage applied

**accross** it.

The Ohm's law (I = U / R) states that the current (I)

**must** be equal to the voltage (U) divided by the resistance (R) of a circuit.

So, a CCS may be seen as a resistor wich the value adapts itself "magically" to keep the current constant still satifiying Ohm's law.

For exemple, a 1 amp CCS to wich a 1 volt is applied looks like a 1 ohm resistor, but if 2 volts are applied

**accross** it, its resistance "magically" changes to 2 ohms in order to maintain a 1 amp current

**thru** it.

Similary, if the current

**thru** the CCS tries to rise (or drop), its resistance increases (or decreases) until the current is restored at its original value and consequently the voltage

**accross** the CCS also changes.

Does this help ?

Yves.