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I've got confused about some features of noise.

1)Can use noise a generator?

Well , if we have a noisy resistor and Ideal resistor why can't we use noise voltage according to noise voltage [tex]Vn=\sqrt(4KTBR)[/tex]

2)why we divide power spectral density to RL( load) when we find power at RL?(it is a normalized voltage^2)?

3)for shot noise, it is better to decrease or increase DC current to reduce noise effect?because according to shot noise current [itex]I_{s}=\sqrt{2I_{dc}qBw}[/itex] I understand we should reduce DC current to decrease noise current but in book text it has mentioned that we should reduce DC current to decrease noise voltage, which is correct and why?

Thanks in advance