Online Electrical Calculators

This section contains basic and advanced calculations of single phase, three phase electric current, power, voltage, voltage drop as well as energy consumption… There will be more calculators added in very near future.

Electrical Calculators

 No. Description of calculator Calculate 1 Voltage Divider Calculator 2 Power Watts Calculator 3 Electric Current Calculator 4 Luminous Flux Calculator 5 Jules Calculator 6 Energy Consumption Calculator (house devices and apparatus) 7 Solar Panel Calculator

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1. Ajayan Pushpan
Apr 05, 2015

I would like to know how to do the cable size calculation for the fire pump.

2. anas
Nov 09, 2014

hello ,thanks alot for these helpful calculations , i need short circuit calculations for cables and CB thanks in advance

3. Pynhunlang Lyngdoh
Aug 20, 2014

Thanks alot sir ….. it is really helpfull.

4. RAJEEV
Aug 10, 2014

Recently my senior share this site to me. Really its very helpful and thanks………..

5. asif
Jun 20, 2014

sir please teach me how to calculate or fill load scheduling table with examples

6. Mohammed Shaaban
Jan 09, 2014

The best site i have ever seen

7. Mohammed Shaaban
Jan 09, 2014

This is the best site i have ever seen thanks for all the great efforts.

8. P.Mohan Ganesh
Jan 05, 2014

Sir,
I am having small doubt
With out rotor if we give 3ph supply to the stator of squirrel induction motor what will happen please clarify

• Cherry Gupta
Dec 11, 2015

Ganesh..The induction motor with the stator and rotor makes up a circuit very much like a Transformer. Now imagine energizing a Transformer which has no secondary….what will the elecrical & magnetic circuits look like…..it will be similar for motor stator with no rotor, energised by phase supply. The air gap will be saturated with a magnetic field generated by the stator. Based on the reluctance of the air gap, the magnetic circuit will require some amount of current to stay energised. Thus the system will withdraw magnetising current. Since there is no rotor, no electrical energy will be converted to rotational (mechanical) energy. Hence normal motor line current will not flow.

9. apu
Jan 05, 2014

thanks

10. bsh
Dec 13, 2013

I m regular visitor of this great site i have never seen before. i realy thankfull to all writer of this site.ihave requested to him that please continue in this

Dec 03, 2012

The calculators are very interesting and useful. However in case of Solar Panel calculator, we can introduce the MPPT voltage of the string to judge that the string voltage is coming within the MPPT voltage range of the Inverter, which is a must for string design.

12. Akash A. Kalamkar
Sep 25, 2012

Thnx 4r making such fabulaus site 4r Electrical engg.

13. yogesh parmar
Aug 02, 2012

i m member & regular visitor of this site, and downloaded many articles, literatures, and software. this is a great site i have never seen before. i realy thankfull to all writer of this site. Especially writer of “Basic of induction motor part 1,&2′”.i have request to him that please continue in this chapter and give more and detailed knowladge in field of INDUCTION MOTOR PROTECTION .I m curious to read about this topic ,sir.

thanking u sir.

• Cherry Gupta
Dec 11, 2015

Yogesh…SImply speaking a motor requires two basic protections….short circuit & thermal. Short circuit protection is provided by fuse or circuit breaker. The thermal protection is provided by a basic thermal bimetallic overload relay or a electronic thermal relay. Since this is a part of a motor starter, you will also have a magnetic contactor which serves to switch ON-OFF the motor power supply, as per start stop commands from a Push button or a process condition (like high level or a low level in a tank) which is sensed by control systems, which send the signal to the starter. Coming back to protection, typically all motor vendors provide hot damage & cold damage curves for the motor and it’s insulation. The thermal protection curve is always below the motor thermal curves. Similarly the motor has a maximum stall time, beyond which it gets damaged (locked rotor situation). The magnetic contactor is rated to meet this locked rotor current, and open when the locked rotor current flows more than a set time, sensed by the thermal protection. A little beyond is the damage curve for the contactor. The fuse curve (or breaker curve) is supposed to coordinate with the thermal curve in such a way that it crosses the thermal curve before the contactor damage curve. This prevents the contactor operating on short circuit and let the fuse / CB operate. If you have a senior electrical engineer in your dept., take this writeup and he/she wil draw the curves for you sna show you how it all works.