I have a very simple question but studying by myself I count not find a way to calculate it. To use a LED with a 9Volt battery I calculated it is needed a resistor of 350 omhs, I just have a 1k omhs resistor and when i put them on circuit the LEDs light was poor (as expected).
Simulating with EveryCircuit showed the power dropped to 1.89V after the 1k resistor.
How to find this 1.89V ?
Thanks ! :grin: