The Electrical Engr.

This video describes how to make a full bridge rectifier SIMPLY and CHEAPLY at home using basic electronic components. Please note that I have used LEDs, you can use even BC547 Transistors and they work great. Be sure that the whole system is safe. Add 10kOhm resistors with LEDs if required.  I hope you will like this video. Please share this video if you have liked and subscribe to my channel. This encourages me to bring more such informative videos on Electrical Engineering in future. Thanks.

Why Starters are required in Electric motors? - EXPLAINED This video describes the basic use of starters in case of an Alternating or Direct Current Motors. By the terminology we understand that a starter is required during starting a motor but this video explains it why. If you like this video, please do subscribe to the channel and share this video. Thanks.

Alternator V/s Generator Alternator and Generator: Are they same or is there a difference? Watch this video to understand where the differences are if any and do subscribe to my YouTube channel as well as this blog to get more such informative posts and videos in future. Thanks.

This video describes working of a Tubelight really simple and I hope you will love it. Don't forget to SUBSCRIBE to my YouTube channel and this blog. The Subscribe option for this blog is at the top of this post. Subscribe to get more such informative posts and videos right in your E-mail. This encourages me to bring more such informative posts and videos. Thanks

The Reverse Psychology One of the c'mon questions always revolve around is that is it possible to convert any sort of Electric motor to electric generator. Well the answer is yes except a few which can't. DC motors and generators are ideal machine for this because one can be easily converted to other just by changing the input from Electrical to mechanical or vice-versa. The normal type or simplest motor that we use in our household is a fan or better if you have an exhaust fan or a table fan rather than a ceiling fan. The electricity when provided to a single phase Induction motor within this fan, it produces torque for the fan to move. But as I said, it is easy to convert a motor to generator just by changing the input from electrical to mechanical, is it possible here in case of a fan? Well yes, and I have made this video to describe how this motor can be used for generating electricity though not useful enough except lighting some LEDs, but this is really a great,...

We have been using various electrical appliances in our household having such socket plugs as shown above. The upper pin is called an earth pin while the lower two are live and Neutral. But have you ever wondered why the earth pin looks so different than the other two pins? If you had, here's the answer. An earth pin is used to discharge any electric current flowing through the metallic enclosure of an electric appliance due to some internal fault or loose connection to the earth. The current flowing through the metallic enclosure is taken up by an earth wire in the appliance and is sent to earth through the earth pin in the socket.  Now in no way, the earth pin should be inserted in live or neutral hole on the socket because in that case, current would flow through the earth pin to the appliance and also will result in burn-out as well as insulation breakdown. That's why, the earth pin is made thick or different in dimension than the other two pins so that ...

Transformer in simplest form is defined as a static device having two Electric circuits which are electrically isolated but magnetically coupled causing transfer of constant power at constant supply frequency from primary circuit to secondary, stepping up/down either Voltage or current.   [image source: Wikipedia] Now let's take into account a good question which I was asked by a person. Which of the following transformers will be largest in size? 1kVA, 50Hz or 1kVA, 60Hz or 1kVA, 100Hz or 1kVA, 500Hz and Why?   It's indeed a good question. You see that power rating of each of the above mentioned transformer is same but operating frequency is different. Had we given different power ratings, it would have been easy to answer that one with higher power rating is larger in size compared to the smaller one. But here, we have to compare in terms of operating frequency. Does frequency affects size of transformer?...Well it does....

Ampere-Hour and Ampe re difference A battery in cars or vehicles is used to start a starter motor which a DC motor which helps in cranking the engine. One such car has a battery rated 12V, 65Ampere-hour. But it throws 300Amps. to the motor. How's that possible? Wondering the same, here's the answer. [image source: supercheapauto.com] It is because Ampere-hour and Ampere are not the same thing. This is a concept many of us don't have idea about. Even I hadn't before. Let me make this clear using the same data provided in the question. The battery in question has a capacity of 65Amp-hr. That's abstarct of the fact which says the battery can deliver 65A for one hour. The Ampere-hour rating is the time-based capacity of the battery. So, we can say, 65A can be delivered in 1 hour. (65×2)=130A can be delivered for 1/2 an hour. (65×3)=195A can be delivered for 1/3 an hour. And so on.. So, the battery can easily deliver 300A for (65/300) ho...

Transmission Voltage are 11kV, 22kV, 33kV, 66kV, 132kV etc. Why? No form factor isn't the reason!   Many people sight Form Factor a reason for so. Form Factor is defined as RMS Value to Average value of a given AC voltage and it is different for different waveforms. Now the commonly used AC waveform we know is Sine Wave. A sine wave AC waveform has form factor of 1.11 (Approx.). So, the reason given is that the transmitted voltage of 10kV, 20kV, 60kV etc. is multiplied to this form factor to obtain such results which you described in the question like For 10kV → 10 x 1.11 = 11.1 kV (Okay! It is approximately correct) For 20kV → 20 x 1.11 = 22.2 kV (Okay! approximately 22kV) For 60kV → 60 x 1.11 = 66.6 kV (Error! it is 66.6kV is considerably greater than 66kV) Like that 120 x 1.11 = 133.2kV (A big error of about +1.2kV because it is 132kV as used) So, at each subsequent step an amount of deviation has been seen which differs the actual and calculated result. Moreover, the ...

Voltage V/s Current   The Original Killer  I have faced this question quite a lot of time and many theories have been put forward to define the answer. But I will try to answer this question with a simple or Layman's analogy. Let us consider the Voltage as height of some building. Higher Voltage or lower Voltage implies higher or lower height of the building. Now, let us consider that you jump off the building (touch a live wire). Higher the building height, severe will be your force of impact to the ground. This impact is what we call current in our analogy which depends upon height of building (Voltage) as well as the surface of impact (Resistance). If you soften the impact surface by laying down soft materials (increasing resistance), you can lower down your force of impact to the ground (current). Further, height of building (Voltage) and type of surface(Resistance) decides force of impact (Current) and hence softer the impact surface(more resistive/protec...

Hello Friends! I am Vivek Choubey, a final year Electrical Engineering graduate student. I am starting this blog to add some of the often asked questions on Electrical Engineering which are thought provoking as well as interesting to know. We learn many topics day to day but due to intense pressure of exams or because of not minding enough on day to day topics, many loopholes and uncleared ideas left behind. I will try to add such questions/answers and topics here which are often asked/thought provoking. Please feel free to let me know your views in comment section or E-mail me at vkconline437@gmail.com . I am active on Quora too at https://quora.com/profile/Vivek-Choubey-5 . You can ask me your questions there. Some of the incredible questions and answers will be added here from other writers too with their permission. I am also a web developer and ardent programmer. I made an HTML5 and JavaScript Simulation tool named VKC CodeBuilder which helps learners and code-testers to ...