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I tried 10K just to see what would happen. 2x 120K 1w got hot. I tried 2x 220K 1/2w and it seems to be ok. they become warm but not burning hot. I will try 220k 1w and will see what would happen.My bridge rectifier used to also get hot when I tried 120k and lower values. However it did not get hot when I tried 220k.
I have read all the comments and done your suggestions but for some unknown reason my 2 resistors get burning hot. I started with 10K and went all the way up to 120K (1w and 2w).Interestingly when I turn off the arduino, they don't get hot or even warm at all.!! but as soon as I supply power to my arduino, those two resistors become hot in matter of 2-3 minutes...please look at my schematic. That red thing on top right is my 5v power supply. I also removed that and tried to power up the arduino from my ICSP but that did not change anything. what do you think the problem is?