I have built this little voltage regulator circuit: circuit diagram
I am a hobbyist, so these may well be screamingly obvious questions. I ask because I haven't found the answer to my first question.
Why does the LM317 get hot even when current is not being drawn, ie when the ends are not connected? (To my intuition it would only get as hot as current that it is 'choking' to reduce the voltage, but if there is no current there is nothing bring down. Where does this evergy come from?)
Why are the two capacitors used in this circuit, it works fine without them? (I know this is a simple question so the technical term for it or alink would totally suffice)