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Questions tagged [electrically-conductive]

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36 views

Pocklington's equation - how to get \$\omega\times\epsilon\$ without knowing frequency?

I'm trying to think of how to get \$\omega\times\epsilon\$ here. It must be simple, just missing something. I know the length of the wire in terms of lambda, the radius, and the voltage on the wire. ...
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35 views

Project of a capacitive finger to test finger Print sensor

How can I choose the best material to use in a project of a "capacitive finger"? The capacitive finger will be used to simulate a human finger , and will be used to test Finger Print Sensor or Touch ...
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1answer
93 views

Can ECG electrodes be used for EEG detection?

Im having financial limitation for purchasing EEG monitoring modules or electrodes. But so is not the case for ECG. I am doubtful whether I can use ECG electrodes for EEG since brainwaves are in the ...
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2answers
87 views

Is it safe to use MG Chemicals Nickel Conductive Pen on a surface exposed to hand/skin touch?

I'm currently working on a project i.e. making a custom controller for my own game. I've to make a glove like controller. I'm currently using wires for making the controller work but I've listened to ...
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0answers
203 views

Triggering touchscreen with only conductive rubber

So I'm making something and the idea is that conductive rubber (10x9x1.5mm) touches the touchscreen and then moves away from it. When touch happens, the touchscreen should detect it. Ofcourse the ...
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1answer
304 views

How can I calculate Ampere Per Hour if Intensity has been given

Today I had an exam on Technology, and there was a question: If a nano robot has a battery of 2.15Ah(Amper per hour) , how much it will last without recharching , if the robot spends 1.8I(Ampere) ...
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2answers
135 views

Is it safe to apply a voltage to a cup of water, and then use the water in that cup as a voltage source for other electronics?

From research it appears that water level detection circuits, such as the one I have included below as a diagram, work on the principle that when the water is high enough to submerge both the +ve and -...
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1answer
60 views

how can I store unused silver conductive glue, is it possible?

I purchased some silver conductive glue. How can I store the unused portion of glue so the needle and the metal portion wont get clogged up after its first use?
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0answers
54 views

Transformer Leakage Inductance and power factor

How does transformer leakage impedance affect power factor? Or how does the X/R ratio of the transformer change the power factor ?
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1answer
78 views

Transformer Ratio

what if we energize 50 Hz h.v side of the transformer with 40Hz, is the transformation ratio don't matter? Suppose 400/200, single phase transformer which is designed to operate at 50Hz. If you ...
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1answer
43 views

AC power supply issue

If I'm getting a voltage of 240 V on an open circuit, the voltage drops to about 200 V when a heavy load is connected to it. (Plasma Cutter in my case. Hence it wont work) Further on, is there a way ...
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2answers
131 views

How to calculate the time that a piece of wire can last before it melts when constant current is applied

How to calculate the time that a piece of wire can last before it melts when constant current is applied? Assume it has a fixed cross-sectional area, I know longer the wire quicker it will melt, but ...
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2answers
275 views

Conductive paint for ESD protection

Will conductive paint applied to the inside of an ABS case prevent the case from getting electrically charged? It was suggested to me to use a conductive plastic enclosure to prevent triboelectric ...
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1answer
66 views

Proper thickness of different copper items normally used in Electric switch and socket?

When i open the plastic casing of electric switch and socket normally used in household like (250 V AC 16 A Switch , 250 V AC 13 A Socket) then i found different shaped copper bar. copper rod, copper ...
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1answer
19k views

What is the difference between 50/51N relay and 50/51G relay [closed]

When do we use 50/51N relay and 50/51G, do they accomplish the same function ?
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2answers
855 views

Why do we use derating factors when sizing conductors?

What is the main reason behind using derating factors in case of determining the cross sectional area of a conductor and what happens if we don't take these factors into account ?
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9answers
24k views

How can I make connection on pcb (circuit board) holes without solder (for prototyping)?

I have a Pro Micro board (very small -- see pic below) and it has connector holes in the printed circuit board. Best Non-Solder Connection (Easy and Removable) I'm wondering the best way to make ...
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2answers
128 views

How does Touch Board work?

Some days ago I saw this device called Touch Board. It looks a bit like an Arduino (in fact it's based on Arduino). You can connect conductive materials to it, like aluminium foil. The board is able ...
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2answers
60 views

What damage can 1500V cause to a circuit? [closed]

I'm working on a device that has a supply of 220 V. The output has an LED at the end of a fibre-optic cable coming from the device in question. If, for some reason, a tremendous amount of voltage ...
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3answers
1k views

What are the uses of Lugs/Ferrules?

I've seen various projects using copper lugs and compressing them with bench vices but what is the actually use? Can't you just use wires without the lugs? Image Source
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3answers
274 views

Are corona discharges any different from normal electricity?

As per Wikipedia corona discharge is a electrical discharge brought on by ionization of fluid surrounding conductor. So can corona discharge be used as normal electricity like travel through wires and ...
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2answers
290 views

Electrical current characteristics through conductor

This is a strange theoretical question, and I won't even begin to try to explain what train of thought has led me to ask the EEs... When electricity travels through a conductor, let's use the obvious ...
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2answers
335 views

Can conductors store charge? [closed]

Why are conductors not used to store charge? How does clouds hold such large volume of charges?
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1answer
327 views

Is it possible for lightning strike to travel up ground / earth pin on a mains outlet?

I live in a country that follows the UK mains specification, where there are 3 pins on a wall outlet with the topmost pin being earth/ground. Now, is it possible that during a lightning strike, extra ...
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1answer
82 views

What is the physical explanation of electric breakdown?

I would like to know what is the physics behind the electric breakdown in gases so they become electrically conductive. So far, all the information that I have found describes the phenomenon in a ...
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3answers
5k views

How to bond/connect wires to neodymium magnets?

After reading this, I learned it is not advisable to solder a wire to neodymium magnets. After more reading I found this post describing the use of conductive epoxy to bond electrical wires to ...
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1answer
73 views

Electric fence charging of peripheral devices

My game electric fence is split into various sections in order to create redundancy. Is there any design that I can charge a battery along the fence line from the joules generated from the line but ...
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1answer
1k views

Detecting mobile phone in airplane mode

I am working on a project to detect mobile phones in a room to avoid cheating. But the airplane mode ha posed a problem. A google search told that all radiations are switched off during airplane mode. ...
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2answers
583 views

step down transformer(240V-9V) [duplicate]

I Have step down transformer that transforms 240V to 9V. However, I cannot find out, which terminals are for input and which are for output. The turn ratio size is very similar, because it is covered....
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1answer
1k views

Looking for electrically-conductive paste

I apologize in advance if this question is a shopping question. I am having problems with noisy connection problems on a metal shield that covers a very sensitive VCO in a professional wireless audio ...