A very junior question.
Often I'd like to know the maximum load current of a simple circuit. After the curcuit is built, I can of course measure this with a multimeter. But for the circuit on paper, I just don't know. And the web won't help me.
The usual comparator circuit might make the problem more concrete. See attached. The relay has a nominal coil current of 60 mA.
How do I measure Imax? Is it the 60 mA coil current, plus the 16 mA Isink of the LM2903? Plus the approximate 1.2 mA for the thermistors? The 2N3904 has a "collector current - continuous" of 200 mA, should I include that? And the diode's 30 uA? Is the capacitor by its nature not included?
Thanks for your help.