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25/06/2026

🔌 LDR (Light Dependent Resistor) Connection – Circuit + Working
📷 Basic LDR Circuit Diagram

🧠 LDR kya hota hai?
LDR (Light Dependent Resistor) ek aisa sensor hai jiska resistance light ke hisaab se change hota hai:
🌞 Light jyada → Resistance kam
🌙 Light kam → Resistance jyada
🔧 Required Components:
LDR (Photoresistor)
Resistor (10kΩ approx)
LED
Battery (5V–9V)
Connecting wires
⚡ Circuit Connection (Step-by-Step):
LDR ka ek terminal → Battery (+) se connect kare
LDR ka dusra terminal → resistor ke ek side se connect kare
Resistor ka dusra terminal → Battery (–) se connect kare
LED ko resistor ke parallel ya series me connect kare (polarity ka dhyan rakhe)
👉 Simple samajh:

(+V) ── LDR ──●── Resistor ── (GND)
│
LED
│
(GND)
⚙️ Working Principle (POC – Proof of Concept):
☀️ Din me (light jyada):
LDR ka resistance kam ho jata hai → voltage drop kam hota hai → LED OFF ya dim
🌑 Raat me (dark):
LDR ka resistance badh jata hai → voltage change hota hai → LED ON
👉 Isliye ise automatic street light me use kiya jata hai.
💡 Practical Use:
Street light automatic ON/OFF
Garden light
Light sensor alarm
Mobile brightness control

04/05/2026

Transformer testing and commissioning with proper Earthing work

03/05/2026

Light Emitting Diode

03/05/2026

Ye kaun sa Equipment hai

LES bulb all Parts wise description
19/04/2026

LES bulb all Parts wise description

An electric fan (table, pedestal, or ceiling) converts electrical energy into airflow using a simple principle: an elect...
19/04/2026

An electric fan (table, pedestal, or ceiling) converts electrical energy into airflow using a simple principle: an electric motor spins blades that push air. It doesn't cool the air like an AC; it just moves air so evaporation on your skin feels cooling.

Pedestal Fans: Working Principle, Types, Components, Applications, Advantages and Disadvantages

1. Main Parts
Motor (heart of the fan): Usually a single-phase induction motor.
Blades (impeller): 3–5 curved blades attached to the shaft.
Capacitor: Helps start and run the motor smoothly.
Switch & wiring: Controls speed.
Guard/grille: Safety cover.

2. How the Motor Works (Simple Explanation)
The motor has two main parts:
Stator (fixed outer part with copper coils).
Rotor (rotating inner part, often squirrel-cage type).
When you switch on the fan:
Electricity flows through the stator coils → creates a rotating magnetic field.
This field induces current in the rotor.
The rotor starts spinning (thanks to electromagnetic induction).
The spinning shaft turns the blades.

3. How Blades Create Airflow
The blades are angled (like airplane wings or boat oars). As they rotate fast:
They push air forward (creating high pressure in front).
Air from behind rushes in to fill the space (low pressure).
Continuous spinning creates a steady wind.
Ceiling Fan Size Guide: Blades and Airflow | ValueLights Blog

4. Extra Features
Oscillation: A small gear mechanism makes the fan head turn left-right.
Speed control: Changes voltage or uses different windings in the motor.
Summary in one line: Electricity → Magnetic field in motor → Rotating shaft → Blades push air → You feel the breeze!
How does an Oscillating Fan work?
That's the basic working in short. Simple, effective, and used everywhere! If you want details on ceiling fan vs table fan or wiring, just ask. 😊

18/04/2026

Auto CAD Transformer testing commissioning commissioning Work

Oily Type Transformer All Winding and Testing commissioning work
18/04/2026

Oily Type Transformer All Winding and Testing commissioning work

motor Winding Continuity Test and systems
18/04/2026

motor Winding Continuity Test and systems

Refrigerator (फ्रिज) एक heat transfer system पर काम करता है, जिसमें अंदर की गर्मी बाहर निकाली जाती है। इसका बेसिक princi...
17/04/2026

Refrigerator (फ्रिज) एक heat transfer system पर काम करता है, जिसमें अंदर की गर्मी बाहर निकाली जाती है। इसका बेसिक principle है V***r Compression Refrigeration Cycle।
🔧 Refrigerator कैसे काम करता है?
🧊 मुख्य पार्ट्स:
Compressor
Condenser Coil (पीछे वाली जाली)
Expansion Valve / Capillary Tube
Evaporator (फ्रीजर के अंदर)
🔄 Working Process (Step-by-step)
1. 🌀 Compressor
Compressor गैस (Refrigerant) को compress करता है
इससे गैस high pressure और high temperature बन जाती है
2. 🌡️ Condenser (पीछे की coil)
यहाँ गर्म गैस ठंडी होकर liquid बन जाती है
Heat बाहर निकलती है (इसीलिए पीछे गर्म लगता है)
3. ❄️ Expansion Valve
Liquid refrigerant का pressure अचानक कम कर दिया जाता है
इससे यह बहुत ठंडा हो जाता है
4. 🧊 Evaporator (फ्रीजर के अंदर)
यह ठंडा refrigerant अंदर की गर्मी absorb करता है
अंदर का हिस्सा ठंडा हो जाता है
Refrigerant फिर से गैस बन जाता है
👉 फिर यह cycle बार-बार चलता रहता है
🖼️ Diagram (Simple समझने के लिए)

[Compressor]
↓
High Pressure Gas
↓
[Condenser] → Heat बाहर
↓
Liquid Refrigerant
↓
[Expansion Valve]
↓
Low Pressure Cold Liquid
↓
[Evaporator] → Cooling inside
↓
Gas back to Compressor

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Bariarwa, Chautrwa
Bagaha
845453

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