I came across a question that was asked to me quite a couple of time: When to use I²R, V²/R or VI while calculating power? At first, the question looks simple and as if it needs no formal explanation but that's not the case. Use of any of them will give the correct result provided that you apply it correctly. Correct application is possible only when you understand the type of circuit you are dealing with. Another important point is to use the one which is going to take less time and help you calculate easily. All of the three equations tell the same thing but their usage is subject to the type of problem you're trying to solve. Let us understand when, how an what to use while calculating power in an electrical circuit.
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Electric generation from fan. How about it?
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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, fun and simple experiment to try out. Just check it out here and try it yourself. Better if you use an old fan which has been used quite a lot rather than a new one. I will explain how does that works in the coming posts. So, stay tuned and don't forget to SUBSCRIBE OUR BLOG to get notified about our blog update in your E-mail first.
Here's the video on YouTube. Subscribe my channel on YouTube to get good tutorials and DIYs on Electrical Engineering.
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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 ...
We know, there are various types of three-phase connected transformers like Star-Star, Star-Delta, Delta-star and Delta-Delta. Open-Delta connected transformer is a special case of three-phase Delta connected Transformer where one phase is removed due to some fault linked to it and the transformer we are left with is called an Open-Delta Transformer or V-V Transformer. It might look like the transformer will not be working but that's not true. The transformer is able to supply the loads but at reduced capacity. Let's see, how it works and what is the reduced capacity. I am also going to discuss about the over-loading capacity of the open-delta transformer. The transformer is called V-V connected transformer because the transformer looks like the English letter 'V' after one of the phases has been disconnected. Download PDF
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....
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