Recent content by GingerLee

After I connected the ground wire properly, there is no more shock. The current in the ground wire is not showing anything. Now its 0 mA. I think so. I was barefoot on marbled floor. And I touched one of the screws of the metallic cabinet. It was not working that's why I called the...

Did you know the some refrigerators have magnetic door seals to close the door tightly? Putting a few low power magnets on door won't matter.

Thanks for telling about capacitive coupling. I think this explains it :) I used a screw driver phase tester, so I guess I checked voltage. The lamp inside the screw driver would glow if its at higher voltage than person using it.

electrons would move forward and backward. for 60Hz AC, electrons move back and forth 60 times in a second. in the first half cycle, when an electron is pushed forward, it pushes electrons next to it, that pushes the one next to it and so on all along the conductor. then in the 2nd half cycle...

Current is created when you apply potential difference across a conductor. Basically you are applying pressure on electrons to move. One electron pushes another and so on. In DC, the pressure is constant in one direction. Electrons are forced to push the other one and keep moving in one...

Hello, My electrician had to disconnect the ground wire from mains distribution box a day ago. And he forgot to attach it back. I did not know it was un-attached. Then in the evening, I touched my computer and got a shock. I used a screw driver type phase tester and checked the ground part of...

Keep two variables for iterations. If the difference between them is < 0.001 then stop loop. Something like this : x1 = a - (fun1(a) / fun2(a)); do{ x0 = x1; x1 = x0 - (fun1(x0) / fun2(x0)); d = x0 - x1; }while(d > 0.001);

Have you ever heard of wolframalpha? I am not sure if I should post links in this forum, but you can google it.

They are symbols for combination. Also written as C(n,1). If you have not studied permutations, combinations, factorial yet, then you won't understand them.

I think, you can use the sum of two angles approach Sin4A = 2 Sin2A Cos2A = 2 (2 SinA CosA) Cos2A = 4 SinA CosA (Cos²A - Sin²A) = 4 SinA CosA (1 - 2Sin²A) = 4 CosA (SinA - 2 Sin³A) = 4 √(1 - Sin²A)(SinA - 2 Sin³A) Similar approach can be taken for other one.

Coils are inductors whether in transformers, electromagnets or something else. When you apply DC voltage to an inductor, it tries to create a magnetic field which creates a force to resist the rise of current. The higher the frequency of breaking on and off the circuit with DC voltage, the...

The information provided in first article is incorrect. Look at the pictures, they seem to be just collected from here and there. The cable in first picture is different, wires are smaller. Then in next two pictures the wire is thicker. And see, if the wire is not insulated, the iron nail would...

You forgot the part on that page which says "Connect up a variac to the coil so you can control the voltage and current going to it." The variac is also called auto-transformer. They usually have a fuse which would blow if you try to short circuit it.

Basic role of resistor remains same in AC circuits as well - to limit the current flow. An easy example : I remember we used to have rheostat type of speed controllers for fans when I was a kid. The good old ac/dc adapters use transformers to step down ac voltage and then rectify it using...

In my humble opinion, if you use all four SCRs then you would end up with negative voltage output for a short duration before s2 and s4 are triggered.