electrialstandards

This is an automatic light switch circuit (Photocell), can run 220v lamps in night automatically up to 10A. Advantages of this circuit: 1-have 5 seconds delay time 2-can run up to 10A load 3-can use for any lamp types such as LED, CFL, low pressure sodium, high pressure sodium, ...etc. 4-adjustable light sensitivity by potentiometer Parts list: Transistor 2N5551(2pcs) Relay 12v LDR Potentiometer 25k Bridge diode 1A Zener diode 12v 1W Diode 1N4007 Capacitor 330-820uF 400v Capacitor 100uF 25v(2pcs) Resistor 270 ohm 2W Resistor 10k Resistor 2.2k Resistor 33 ohm you must put it in a small transparent plastic box for electric and moisture insulation. NOTES: 1-Don't touch the circuit when it connected to electric line. 2-Put it away from lamps light (above the lamp)  As you see in this pic. i used 3A relay rather than 10A to make the circuit small as possible since my loads consume very low current   In following video you can see step by step making this Photocell:

By this circuit you can run more than 70 LEDs by an AA battery. The circuit draw 100 to 200 mA from the battery. you can find the choke coil from a mobile charger or old flash camera or rechargeable fly zapper. Parts list: Transistor 2N2222 Resistor 1k Chock coil LED(70pcs) Battery 1.5v NOTE: 1-test the output voltage before connecting that to the parallel LEDs. (2-3v is good) 2-using bigger transformer(choke coil) and power transistor maybe raise the output voltage up to 100v.    

Ceiling fan is integral part of every house and Industry. In this article we discuss about wiring of ceiling fans and circuit diagram of ceiling fans. Ceiling fan are having “Capacitor Start capacitor Run motor”. These motors have capacitor in series with starting winding. Capacitor used for this is electrolytic type. Due to this capacitor single phase get divided into two phases, due to this magnetic field is produced and due to which motor starts to rotate. get upto 40% off Circuit diagram for ceiling fan is as shown below where capacitor is connected in series with starting winding. How to reverse the direction of ceiling fan? Direction of Ceiling fan motor can be reversed connecting capacitor with running winding instead of starting winding.  Wiring of ceiling fan:- Ceiling fan connected to power supply through a switch and regulator.  Usually phase is rotated through switch and regulator and neutral is directly connected at ceiling fan. Fan regulator is used to control th...

Faraday’s law of electromagnetic induction explains about working principle of following:- (i)                    Induction Motors (ii)                   Generators (iii)                  Transformers (iv)                  Inductors This law was given by Michael Farday. This law provides relationship between current and magnetic field. There are two Faraday laws of Electromagnetic Induction as stated below:- Faraday's  First Law of electromagnetic Induction According to this law whenever there is change in the magnetic field of a coil there will an emf to be induced in the coil. This induced emf is called as induced emf. If circuit of conductor is clos...

This is an amazing LED flasher that run by only 1.5v AA battery. The circuit based on joule thief method. main circuit was designed by handmade choke coil but i change that to this new circuit that don't need to coil making because that was very difficult. you can use an electric zapper choke coil. the flashing speed can change by potentiometer. A new 1.5v alkaline battery can run this circuit for more than 30 hours(by lowest flashing speed). I test this circuit by 25 LEDs but you can add more. Zapper choke coil usually have 6pin and 3 internal coil. in first you should determine that by an ohmmeter, then put that in the circuit. the temperature of  transistor raise in high speed flashing, so need to a heatsink.  Parts list: Transistor 2N2222 Resistor 100 ohm Potentiometer 1k Capacitor 100uF 35v Chock coil of old camera or electric zapper or mobile charger Battery 1.5v AAA or AA LED Diode 1N4007 Diac DB3  

Cable size and current carrying capacity for XLPE insulated cable, non-armored, Twin or multicore cable is as below:- Conductor operating temperature is 90 degree Celsius Ambient temperature: 30 degree Celsius. Cable size and current carrying capacity for XLPE insulated, Armored, Twin or multicore cable is as below:- Conductor operating temperature is 90 degree Celsius Ambient temperature: 30 degree Celsius. For air and 20 degree Celsius for ground for installations require to comply with BS: 7671 Correction factors:- For Ambient temperature: Ambient temperature in degree Celsius Correction Factor 25 1.02 30 1.00 35 0.96 40 0.91 45 0.87 50 0.82 55 0.76 60 0.65 65 0.58 70 0.50 75 0.41 80 Ground Temperature Ambient temperature in degree Celsius Correction Factor 10 1.07 15 1.04 20 1.00 25 0.96 30 0.93 35 0.89 40 0.85 45 0.80 50 0.76 55 0.71 60 0.65 65 ...

Induction motors are part of every industry and Household. There are motors available from fraction of KW to 375 KW motors. Induction motors are also available with higher ratings but those are HT motors. AC Motors current rating chart for induction motors is as given below:- KW Rating Horse power rating Three Phase (415V Supply) Single Phase 220V Supply 0.1 1/8 0.4 1.6 0.12 1/6 0.5 1.9 0.18 1/4 0.7 2.3 0.25 1/3 0.9 2.9 0.37 1/2 1.3 3.9 0.56 3/4 1.6 5.5 0.75 1 1.8 7.3 1.1 1.5 2.6 10 1.5 2 3.4 13 2.2 3 5 19 3 4 6.5 24 3.7 5 8 27 4 5.5 8 30 5.5 7.5 11 41 7.5 10 15 55 9.3 12.5 18 10 13.5 20 11 15 22 15 20 28 18 25 36 22 30 39 30 40 52 37 50 69 45 60 79 55 75 96 75 100 125 90 125 156 110 150 189 130 175 224 15...