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Also, if it doesn't have an adequate heat sink it will get NOWHERE near it's rated output current as it will go into thermal shut down.
How does a non-EE figure out when to add a heatsink? And what kind of heat sink?
Typically a 7805 wont need a heatsink if the circuit is designed correctly. They are thermally protected in case they do get overloaded so it will shut itself off until it cools back down. If you see it doing this you either have too much input voltage or the regulator is ready to fail. These do not go bad very often. You can test it in circuit by looking for +5 on the far right leg(iirc).
Can a lm323k 5volt regulator be tested in circuit?
How is it done?