How to calculate protecting resisotor betwen power supply and load ?

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andro

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I have question about, if i have a load (example Microcontroller) needs max constant voltage dc = 5 V and max constant current 100 mA
and i have a power supply can supply only 5 v dc with max current 1 A
How to calculate the protection resistance that should be connected between microcontroller and power supply without damaging the microcontroller ??
If i calculate the resistor required between power supply and microcontroller
it will be
[5(power supply) - 5(Microcontroller) ]/100 mA = ????

Thank you
 

Microcontroller will never damage if you connect it directly with the power supply. It will draw only that much of current which it needs, no matter how much current your power supply can provide.
 

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