Reducing the AC voltage using resistors
* Danger *

According your question you are probably trying to make a direct, transformer-less connection to 220VAC. There is SERIOUS RISK of death by electric shock in what you are doing!!!!

* Danger *

I hope you take my above warning seriously. If you still want an answer to your question, make the math by yourself and check that the power dissipated by the 100K resistor is close to 1/2W. Depending on the size of the resistor, it could put a lot of heat on it and even burn it.
Usually transformer-less power supplies are done using Capacitor in series, but if you are not VERY cautious, you are risking your life.