![voltage - Is there a point in adding a 1 Ohm resistor to this LED circuit? - Electrical Engineering Stack Exchange voltage - Is there a point in adding a 1 Ohm resistor to this LED circuit? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/l4aIY.png)
voltage - Is there a point in adding a 1 Ohm resistor to this LED circuit? - Electrical Engineering Stack Exchange
![Amazon.com: Alpinetech 16mm 5/8" Anti-Vandal O-Ring LED 2.8V/1.8V Momentary Stainless Steel Metal Push Button Switch Flat Top Shallow Depth for (100/150 ohm Resistor Included for 4.2V) (Green) (Yellow) : Industrial & Scientific Amazon.com: Alpinetech 16mm 5/8" Anti-Vandal O-Ring LED 2.8V/1.8V Momentary Stainless Steel Metal Push Button Switch Flat Top Shallow Depth for (100/150 ohm Resistor Included for 4.2V) (Green) (Yellow) : Industrial & Scientific](https://m.media-amazon.com/images/I/51TTM-qOrhL._AC_.jpg)
Amazon.com: Alpinetech 16mm 5/8" Anti-Vandal O-Ring LED 2.8V/1.8V Momentary Stainless Steel Metal Push Button Switch Flat Top Shallow Depth for (100/150 ohm Resistor Included for 4.2V) (Green) (Yellow) : Industrial & Scientific
![Transistor controlled LED ring and help with resistor calculations - General Electronics - Arduino Forum Transistor controlled LED ring and help with resistor calculations - General Electronics - Arduino Forum](https://aws1.discourse-cdn.com/arduino/original/4X/d/b/d/dbd5a310d8c487ef75700e412321305353ea57d7.png)