LED (Light Emitting Diode)
Diode Output Component
Part Number / SKU: 5mm LED (Red, Green, Blue, White)
📋 Technical Specifications
Type: Light Emitting Diode
Sizes: 3mm, 5mm (common)
Forward Voltage:
Red: 1.8V – 2.2V
Green: 2.0V – 3.0V
Blue: 3.0V – 3.3V
White: 3.0V – 3.3V
Forward Current: 10–20mA
Polarity: Anode (+), Cathode (–)
Mounting: Through Hole
🔹 LED क्या है?
LED (Light Emitting Diode) एक ऐसा electronic component है जो current मिलने पर light देता है।
🔹 यह कैसे काम करता है?
जब LED को सही polarity में voltage दिया जाता है, तो यह light emit करता है।
👉 Current गलत या ज्यादा हुआ → LED खराब हो सकती है
🔹 LED के Types
🔴 Red LED
🟢 Green LED
🔵 Blue LED
⚪ White LED
🟡 Yellow LED
🌈 RGB LED (multi-color)
🔹 Polarity (बहुत important)
लंबी pin → Anode (+)
छोटी pin → Cathode (–)
👉 गलत जोड़ोगे → LED नहीं जलेगी
🔹 Voltage & Current
LED Type Voltage Current
Red ~2V 10–20mA
Green ~2–3V 10–20mA
Blue ~3V 10–20mA
White ~3V 10–20mA
🔹 Resistor क्यों जरूरी है?
LED को direct battery से जोड़ोगे तो यह जल सकती है
👉 इसलिए current control करने के लिए resistor जरूरी है
🔹 Resistor Calculation (Formula)
R=
I
V
source
−V
LED
🔹 Example (बहुत आसान)
👉 Supply = 9V
👉 LED = 2V (Red)
👉 Current = 20mA (0.02A)
👉 R = (9 - 2) / 0.02 = 350Ω
✔️ Practical में use करो → 330Ω या 220Ω
🔹 कहाँ use होती है?
Indicator light
Arduino projects
Water level alarm
Decoration lighting
DIY electronics
🔹 What is LED?
LED (Light Emitting Diode) is an electronic component that emits light when current flows through it.
🔹 How it works?
It glows when forward voltage is applied with correct polarity.
🔹 Types of LED
Red
Green
Blue
White
Yellow
RGB LED
🔹 Polarity
Long leg → Anode (+)
Short leg → Cathode (–)
🔹 Voltage & Current
Red → ~2V
Green → ~2–3V
Blue/White → ~3V
Current → 10–20mA
🔹 Why resistor is needed?
To limit current and protect LED from damage.
🔹 Resistor Formula
R=
I
V
source
−V
LED
🔹 Example
9V supply, Red LED (2V), 20mA:
R = (9 - 2) / 0.02 = 350Ω
Use 330Ω or 220Ω practically.
🔹 Applications
Indicator lights
DIY projects
Electronics circuits
Arduino projects