Questions tagged [electronics]

Electronics is the study of electric circuits and electrical components, and the design of useful devices. Some questions in this tag may be more appropriate for the [Electrical Engineering(https://electronics.stackexchange.com/) SE site.

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17 views

What defines a material is an anode or a cathode?

How to know if a material is an anode or cathode? and if i connect an anode and a cathode will it be a diode? Like the pensil razor diode, if it worked not because of that, how does it work?
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73 views

Please tell me how to solve star resistance network [closed]

Please tell me how to solve star resistance network I have tried solving it, but the connection between the crossed resistances is confusing me.
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2answers
103 views

Voltmeter connection across motor

I want to measure the voltage(potential difference) acorss the motor A. Where should I connect the voltmeter? I am confused between two possibilities: between X and Y (between two ends of the motor ...
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46 views

Why can I hear the treble sounds through a speaker, such as on my phone, better than I can with headphones?

I'm not sure if this is related to my hearing loss, or if anyone else has noticed it, but I find it easier to hear higher frequency sounds coming out of a speaker that I hold up against my ear versus ...
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1answer
359 views

Voltage drop across an inductor in a RL circuit

for a circuit that has a resistor (resistance R), and a inductor (inductance L), that are connected in series to a source of AC electromotance. How do I find the voltage drop across the inductor in ...
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1answer
3k views

Mass-Action Law

So,here's the equation of Mass-Action Law:- $ np =n_i^2 $ Here, $ n= $ Electron Charge Density ; $ p= $ Hole Charge Density And, $ n_i^2= $ Intrinsic Charge Carrier Concentration The equation is ...
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1answer
168 views

LC Circuit with a DC input

In the previous LC circuit, if we connect one end with a DC input voltage and the other with ground, what does the oscillating output wave look like? I know that if the capacitor was initially ...
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1answer
46 views

Relating to IR rays [duplicate]

I am working on a project where I am putting an IR sensor similar to what we use IR module for Arduino.I just want a material that can pass the IR rays but it should be opaque to visible eyes .Like ...
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1answer
114 views

Things that must be considered when mass producing a capacitor [closed]

The question is to list four things that must be considered when a capacitor is chosen for inclusion in a circuit which is to be mass produced. Are there a specific set of four things? I've come up ...
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1answer
1k views

Can conductivity (or resistivity) value be assigned to 2D materials?

2D materials, such as graphene monolayer or graphene nanoribbon, don't really have a cross section. By definition, conductivity is $\sigma = \frac{J}{E}$, and $J$, the current density, is calculated ...
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2answers
4k views

Why is it that potential difference decreases in thermistor when temperature of circuit is increased?

Why is it that potential difference decreases in thermistor when temperature of circuit is increased? From my understanding when temperature increases, there are more free electrons ($n$) so according ...
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1answer
104 views

Video recording interference

I'm currently working on an Android App that records while driving in a car. Similar to the popular Dashcams. While developing this App I saw a lot of ugly glitches on my videos. I used a Nexus 5 for ...
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2answers
83 views

What temperature will create amorphous TiSi?

At what temperature will create amorphous TiSi? I think it's around 500 Celsius but I'm not sure.
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51 views

Creating some sort of optical transistor

Is there a way to create an optical transistor that runs using a cheap laser and made using mirrors and lenses? My point of using that is to make an optical logic gates, but there is another problem ...
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1answer
54 views

Ohm's Law in Practise [closed]

When the AUX pin of a stereo is connected to my mobile phone's audio female port, I just measured the voltage at the end of this AUX pin (No load is connected) approximately 2mV using a DMM. But when ...
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1answer
388 views

Question on Fuse Placing [closed]

Please answer Q.no 11 (where should the fuse be placed and why?)
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1answer
66 views

Bjt configuration

In common base configuration,we know that alpha is almost 1 which means that the base current is almost zero.But what is the physics behind this base current almost equal to 0?And similarly in common ...
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1answer
799 views

Can a mobile phone emit gamma rays? [closed]

I heard that inside the battery of mobile phones (but also of other electronic devices) can happen quantum leaps that cause the emission of gamma rays photons. Is this phenomenon really possible?