Watt's the wattage when used on a PIC?

[ERMEGM]

Dave with a 47k resistor the current at 12 volts is only about 255 Micro amps. I have used this method hundreds of times and never had any problems. The input resistor can be as high as 270K and stil works well.

So just one resistor from the input wire going to the input pin? Does this work in even the noisy environment of vehicles?