So I was asked to find the Norton Equivalent of the circuit above. The solution stated that the 8mA current and the 20kOhms resistor have no effect on the circuit with respect to terminals a,b and, hence, can be removed. From what I can understand, an ideal current source will take on any value of voltage and vice versa; so the 8mA current source will act the same as a 30v voltage source in place. What I don't understand is why the current source and the resistor have no effects on the circuit and would it be the same if I removed the 30v voltage source instead of the current source? Please help!