tutorials:learn:arduino:leds.html
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tutorials:learn:arduino:leds.html [2012/07/06 02:30] fabelizer [Solving for the current] |
tutorials:learn:arduino:leds.html [2016/01/28 18:05] (current) |
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| - | <class style3>Last Quick Quiz!</class> \\ **How much current is flowing through the LED when the pot is turned down?** \\ //Highlight the text below to see the answer //** ** | + | <class style3>Last Quick Quiz!</class> \\ **How much current is flowing through the LED if when the pot is turned down? The forward voltage of the LEDs are 2.2V.** \\ //Highlight the text below to see the answer //** ** |
| - | <class white>(5V - 2.2V) / 100 ohm = 28 milliamps </class> | + | <class white>2.2V / 100 ohm = 22 milliamps </class> |
| **What about when the potentiometer is turn all the way 'up'?** \\ //Highlight the text below to see the answer //** ** | **What about when the potentiometer is turn all the way 'up'?** \\ //Highlight the text below to see the answer //** ** | ||
| - | <class white>(5V - 2.2V) / 10100 ohm = 0.27 milliamps </class> | + | <class white>2.2V / 10100 ohm = 0.217 milliamps </class> |
| Whew, that was a long and very math-intensive lesson. We'll get back to doing more with software and fun blinky in future tutorials, but we hope that this tutorial helped you understand some of the details of how to wisely use LEDs! | Whew, that was a long and very math-intensive lesson. We'll get back to doing more with software and fun blinky in future tutorials, but we hope that this tutorial helped you understand some of the details of how to wisely use LEDs! | ||
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/home/ladyada/public_html/wiki/data/attic/tutorials/learn/arduino/leds.html.1341541834.txt.gz · Last modified: 2016/01/28 18:05 (external edit)
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