An LED has two qualified prospects: the anode (positive) and also the cathode (negative). It is vital to attach the LED the right way about inside a circuit—LEDs are polarized components, and reversing the polarity will prevent them from Doing work. Gentle-emitting diode (LED) is usually a greatly used standard https://www.uk-exhibitionstands.co.uk/a-guide-to-the-business-show-2019/