how to change the brightness of an LED by using different values of resistor?
Component Required:
Below is an example.
①The simplest kind is just a grid of holes in a plastic block. Inside are strips of metal that provide electrical connection between holes in the shorter rows. Pushing the legs of two different components into the same row joins them together electrically. A deep channel running down the middle indicates that there is a break in connections there, meaning, you can push a chip in with the legs at either side of the channel without connecting them together.
In this lesson, you will use perhaps the most common of all LEDs: a 5mm red LED.
The unit of resistance is called the Ohm, which is usually shortened to Ω the Greek letter Omega. Because an Ohm is a low value of resistance (it doesn't resist much at all), we also denote the values of resistors in kΩ (1,000 Ω) and MΩ (1,000,000 Ω). These are called kilo-ohms and mega-ohms.
The resistor color code has three colored stripes and then a gold stripe at one end.
If you find this approach method too complicated, you can read the color ring flflag on our resistors directly to determine its resistance value. Or you may use a digital multimeter instead.
The UNO is a convenient source of 5 volts, which we will use to provide power to the LED and the resistor.You do not need to do anything with your UNO, except to plug it into a USB cable.
With the 220 Ω resistor in place, the LED should be quite bright. If you swap out the 220 Ω resistor for the 1kΩ resistor, then the LED will appear a little dimmer. Finally, with the 10 kΩ resistor in place, the LED will be just about visible. Pull the red jumper lead out of the breadboard and touch it into the hole and remove it, so that it acts like a switch. You should just be able to notice the difffference.
At the moment, you have 5V going to one leg of the resistor, the other leg of the resistor going to the positive side of the LED and the other side of the LED going to GND. However, if we moved the resistor so that it came after the LED, as shown below, the LED will still light.
You will probably want to put the 220Ω resistor back in place.
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