After producing a little smoke with my Arduino, I've decided I need to finally understand "current".
I'm particularly confused about the idea of a component "drawing" current. I had thought in terms of power supplies providing some amount of current, devices needing some minimum current to operate, and devices handling some max current input. But "drawing current" sounds like the component is somehow "pulling" it out of the power supply.
I've read some basic electricity tutorials, and thought I had some sort of understanding of current, voltage, and resistance. But now I see that I don't understand.
Can you point me to some good explanations on the web? Or a book, even.
When you apply Ohm's law, keep in mind which of your three values are being held to a limit. Voltage is usually fixed, by the limit of your supply; if the resistance of the circuit is fixed as well you can predict what the current will be. And if that resistance is VERY low, the current will be... what, class?
Class: VERY HIGH!
Good. I hope you are all prepared for the quiz next week...
Seriously though, you shouldn't be paying as much attention to mr.s Ampere, Volta, & Ohm as you should to a gentleman named Grob. Go to Amazon, find a Grob, put it on your workbench and start wearing it out like the rest of us.
