Circuit Schematic Antics

[Slothery]

Alright so I am reading the book "Getting Started in Electronics" by Forrest M. Mims III and I still am confused with schematics. For example, in this circuit (first picture) why does Vout connect to the circuit before the photo-diode gets its reading? Finally, in the next picture the LEDs are hooked up before the resistors? How can this be if the resistors are needed to limit the current?

[billhowl]

Read this for LED connection
http://www.societyofrobots.com/robotforum/index.php?topic=11786.msg89175#msg89175
for photo-diode
http://www.societyofrobots.com/schematics_photoresistor.shtml

[Slothery]

I'm not concerned with the individual components more with the flow of electricity. Thanks though!

[Razor Concepts]

Electrons flow from negative to positive.

That doesnt matter anyways, the leds would work either way, before or after resistors. You cant look at a circuit component by component, you must look at the entire loop. Either way, the resistor limits the current, and the LED uses the rest.