Questions tagged [electricity]
The study of the presence and flow of electric charge. Charges, currents, fields, potentials.
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How does the rise in temperature of fuse wire depend upon its radius?
The question could be understood as if we have two fuse wires one of current rating 1 A and one of current rating 8A then what should be the ratio of their radius?
I tried the following:
We know, $Q =...
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What is the "closed circuit" of a bug swatter racket?
There are bug swatter racket that can kill fruit flies, mosquitos, or flies, if the insect touches the metal mesh.
However, when I look at the construction of the device, the metal mesh is all one ...
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Fuel Cell Operating Pressure
I have seen anecdotal testing of fuel cell stacks. Intended to demonstrate that their power output can be improved through the addition of a centrifugal blower.
What are the limits associated with ...
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Flow of electrons in wire
If we apply potential difference through wire we know that there is an electric current which is the flow of electrons.I want to know how do electrons move do they move within wire like in the picture ...
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Static Shock and Cell Phone
Please be kind - have probably a silly question about static electricit, the type when you walk across a carpet and touch something and you get a spark/shock on your finger.
Hoping someone here can ...
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Is the electric potential at the mid point between two equally oppositely charged plates zero
Is the electric potential at the mid point between two equally oppositely charged plates zero.
granted between the plates there is uniform fields.
and what would the resultant potential graph look ...
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Will a metal rod kept under very bright light for a huge amount of time, be able to conduct electricity?
I was just sitting when it came to me - will a metal rod that has been kept under bright light for a very long time, be able to conduct electricity?
I was thinking that because of photoelectric effect,...
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Why don’t nuclear reactors burn through most of their fuel before discarding it?
The question: Why don’t nuclear reactors use more of the fuel, eg, 50%, 80%, before discarding it? It looks like there is plenty of energy left, and uranium is expensive. Also, there would be an ...
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What can cause a spot above my WiFi router's antenna? [closed]
Lately a weird dark spot has appeared right above the antenna of my wifi router. It wasn't there before.
I have tried to wipe it and it got a little bit brighter but I don't think it's dust.
My guess ...
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Modeling electric discharge in a game [closed]
I am working on a game with a basis in physics, abstracted and simplified but with an attempt to preserve the core of real physics.
For example, fire effects don't do direct damage, but generate heat. ...
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Electrostatics (Waler Lewin's Lectures): Cat-fur, Nylon Jackets, and Charges
https://www.youtube.com/watch?v=x1-SibwIPM4&list=PLmPcD-wiF4EY2y3oHGsoqG6C1PBMkmJSQ
Please consider the above video from 24:15-25-32.
I would like to understand how the charge is being transferred ...
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Is there electric field inside the conductor in moving charges case?
Is there an electric field inside a conductor when steady current passes through it ?
I have two conflicting notions here : I was watching this Electroboom video and at minute $14:00$ electroboom ...
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How can one explain the small amplitude resonance before the onset of main resonance condition?
I was using a sonometer to verify the frequency of a.c. supply in the lab is 50 Hz. For this the equation I used is
f=(1/4L) x Sq. root (T/m)
I set tension T = 4.9 N by hanging 0.5kg mass
mass per ...
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Why is current defined as $dQ/dt$ even though it is not defined as the rate of 'change' of flow of charges?
I do not understand this definition. $dQ/dt$ represents the rate of CHANGE of charge flow at an instant even though current is defined as only the charge flow per unit time.
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Would be possible to cover all the deserts with solar plates and satisfy the demand of electricity?
if we covered all the deserts with solar plates , would that be the solution to the energy crisis ?
i mean put a solar plates in ALL the deserts of the earth to harvest all solar power
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Can Sagnac effect be observed in coiled, rotating electrical cables conducting electric signals?
Can Sagnac effect be observed in coiled, rotating electrical cables conducting electric signals, in a similar way to that observed in coiled, rotating optical fibers? And if so then who demonstrated ...
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In depth answer: Why do I see sparks when I remove synthetic clothes off my body?
I have combed through various sources on the internet and I don't have a definitive answer for the above question:
The best that I can come think is the following:
Because when I remove synthetic ...
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Sea electricity problem
If salt water is a good conductor of electricity so does it mean if we put a very large voltage somewhere in the sea then person all across the world will experience some current and are there any ...
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Is Faraday's cage described in electrostatic 100% insulated?
I apologies if my wording is bad or it is duplicate.
I'm new to Electrostatics. During the topic of conductors & electric
field I was introduced to Electrostatic Equilibrium state in which
the ...
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Why can't we calculate potential at a particular point due to an infinitely long thin wire with uniform positive linear charge density?
I read in theory that we cannot calculate at a particular point due to an infinitely long thin wire with uniform positive linear charge density. Instead we can only calculate the potential difference ...
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Can I guess the order of magnitude of the current inside a spark based on a picture?
In this video, Steve Mould explains how an inflammable gas can be ignited with a spark created by the piezoelectric effect. At 01:11, there is a close up on the spark with a scale in the background.
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Why don’t charge carriers constantly accelerate in an electric circuit?
With my current knowledge of electric circuits and electrostatic fields, I would expect that the electric field generated by the potential difference of, say, a cell should exert a constant force upon ...
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Reverse electrowetting on dieletric using air bubble displacement for electricity generation
I read this research paper and it uses bubbles to change the electrolyte and electrode interface, thus causing a change in capacitance as the bubble forms and exits the electrolyte.
For reference: ...
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Does a d'Arsonval coil / Oudin coil / "violet ray" electrotherapy device produce a complete circuit?
A few different historical designs exist for "medical" devices that generate a high-frequency oscillating voltage at the open end of a resonator circuit. Solid-state versions are sold on ...
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Electrostatic: do Electrons really go away?
So imagine the classic science experiment where you take an empty aluminium can and a rubber bar that you charge with fur.
At first, that can is electrically neutral.
Two different cases now that I ...
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Why the magnetic field inside solenoid is parallel?
We know that inside solenoid the magnetic field are same at all point's and are parallel to each other
My question is why they are parallel as my teacher explained it as solenoid is set of multiple ...
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Why do you feel ripples by sliding finger on an AC-powered macbook surface?
It doesn't have to be a MacBook exactly, other switched power supply powered metal case devices are good enough, but MacBook is the most common.
It must be AC powered; the effect disappears when ...
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What exactly is charge and what does it have to do with anything? [duplicate]
Often charge is defined as a measure of interaction with the electromagnetic field. However, electromagnetic field is often defined as a field produced by moving electrical charges, or relates to ...
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Do power plants even follow law of conservation of energy [closed]
Correct me if i am wrong but all circuits must follow the law of conservation of energy.
And the energy is supplied by the action of source to create a potential difference by moving charges against ...
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Direction of electric field and current [closed]
What is the direction of electric field in electric circuit is it positive to negative or negative to positive? Is the direction of current same as the field?
