Electricity Definition and 999 Threads

Hey guys. Electricity is a fascinating thing that I steer clear of, however, when scrolling YouTube a decade ago, I found out that there are hand-cranked machines that make sparks. Do any of you guys own one of these electrostatic machines? If so, what got you into owning one?

This is the diagram given for the problem. Now I was able to identify, that the fact that the capacitance of a spherical capacitor, with one plate and the other at an infinite distance, is somehow to be used in this problem, i.e ##C= 4\pi\epsilon_0R ## IF I can replace all the spherical...

I have tried to solve this problem by using the Columb's Law. Basically, I draw the graph and attempted to find the point where sum of the forces are zero. Here is what I have. Is there anything wrong in my working? Why can't I solve d in terms of a?

I am very confused, all i have thought about right now is that, in that isolated branch connecting A, B and C, the net charge would be conserved. Not sure how to proceed. I feel that, if there is a charge ## -Q ##at A, and a charge ##-Q_1 ## at B, then the charge at C MUST be ## Q+Q_1 ## maybe...

About Rod Mack Rod Mack, has had a lifelong fascination with electricity and physics. His journey into the world of electrical engineering began at a young age when he received his first train set at the age of three. Demonstrating an innate understanding of electricity, he fixed the train set...

Hello Dear Members I would like to ask that i need to make electricity generated and stored in battery of E bike through seat of E bike . No pedaling only seat should be used , the battery of E bike is 48V Thank you very much

It's simply a theoretical question.

there are 4 options. a) the fuse blows b) the appliance becomes live c) the appliance catches fire d) the appliance doesn't work. the answer given is b) , because the earth is connected with the live. but i would like to know why issn't option d) correct instead? since the live and earth...

If there s adc current source between terminals a and b theres two paths for current to flow from A to B.(the two semicircles) i know that voltage across both paths will be same. But im confused as to how these voltage drops across both paths would be equal.For eg on the left side of A current...

I tried using gauss law. This is how i set it up: I took a gaussian pill box of same area and very small length dx, the diagram is amplified for obvious reasons. Assuming theres a constant field in the yellow portion ##E_{1}## and a constant field ##E_{2}## in the green portion. I assume the...

$$P=IV \left [ \frac {cos\phi} {\sqrt{1+THD^2}} \right ]$$ The reason for asking is, I can’t find the equation written out in full like this. A friend wants to know why his generator is rated in kVA. Having done basic school physics, he’s familiar with P=IV in the DC steady state, so is...

Hi Friends! Regard the 2 kW electric kettle and 60 W incandescent bulb - what happens if we plug them in series? It is the problem I often ask my students somewhere at the end of the term to check if they remember basic "laws" about electricity. Recently I started collecting some exercises on a...

Homework Statement: not homework Relevant Equations: I dont know them Okay, so I thought this may be a good place to get some advice. Before we pull the mental or neurological health card can we please have a think about what i have to say. The apartment above me most certainly has something...

$$I=\frac{q}{t}$$ $$=\frac{4Q}{T}$$ $$=4Qf$$ My answer is (a). Is that correct? Thanks

I'm working on the following differential resistance problem and wondering wether I'm approaching the question the right way. The problem is to find an expression for the resistance in the ##x##-direction of a wire with electrical resistivity ## ~ \rho ~ ## in terms of ##~ z_0 ~##, ##y_0 ~ ##...

I tried to start by assuming that we need to integrate something over 1 period (2pi). Therefore, we need i(t)^2 R integrated over something. From there, I recognized that this is an underdamped model since R/2L < 1/sqrt(LC). I believe that i(t) can be represented by i(t) = e^(-at)[A_1 cos(w_d t)...

A vibration moves along until it has moved too far or there is no other objects to travel to, so does that mean it could carry electricity or something chemistry related?

Quick question, is 5 milliamps at household voltage like 240 dangerous? See many conflicting views on this, official accounts state that on an electric shock chart, 5ma is nowhere near the level needed to cause any damage but some electricians on reddit say with low body resistance even low...

In electrical circuit there are three resistors and a battery connected in series. After the first two resistors, there is a point connected to the ground. Why is the voltage difference between the ground point and the positive of the battery not 10 volts? In that circuit, I think that the...

Can we describe / explain the B x v force in the electron's own reference frame without reference to relativistic invariants, 4-vectors, tensors et al? The aim would be to explain things like the following video without the notion of "field lines" that electrons and wires move through. But the...

Assume there are two tall building with same height, and the materials are the same, having same distance away from the storm cloud. Will the one building with extreme high consumption of electricity cause higher chance to get struck by lightning than the one building without ? Thanks!

How much power (Megawatts) would it require if we were to create a magnetic field as large and strong as the Earth's magnetic field?. I haven't learned how to calculate this, but just curious.

hello, I'm a retired mechanical engineer always puttering on something looking to expand my knowledge on electrical power and primarily home power generation in grid tied systems

The following circuit is: Going clockwise the current ##I_1## goes through resistor ##R_1## and voltage ##V_11##. Current ##I_2## goes through capacitator ##C_1## and ##R_2##. Current ##I_3## goes through resistors ##R_3## and ##R_4##. Current ##I_4## goes through resistor ##R_5##, but from...

For the last few weeks I've been breaking my head over an efficient way to make electricity from our wood fired stove. We don't need huge amounts, but about 500 watts would be nice. I'm a retired engineer and I'm taking this on as a hobby really. I've gone through various ideas and iterations in...

I have attached a PDF file.

If the earth has been revolving around the sun almost perpetually, we should mimic this motion for electric generative purposes or is it not feasible?

Hi,I m studying for college and I need to receive some info from you guys. Which books should I use to study mechanics,thermodynamics,electricity and magnetism? I have no idea what books I should study because my own physics teacher has some pdfs in her USB and I can t borrow the USB because...

Hi My grand daughter is a senior in HS, She even took AP physics and calculus, BUT she never learn simple electrical stuff, like the basic V= I x R. I want suggestion of some good links she can read about very basic electricity/electronics starting with V = I x R. Of cause I know all those...

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Hi, my question is about electricity, hydrostatic pressure, potential energy and friction. Using an electrically powered compressor (such as compressors used to fill diving bottles) if I fill a tank of volume 10 cubic meters to a pressure of 100psi, 1. what is the potential energy stored in that...

TL;DR Summary: What would happen if a bolt of continuous lightning hit an enclosed saltwater space with someone swimming far below the surface? Hello! I'm actually asking this as a DM for a DnD campaign. One of my players trapped a bad guy within a large (30m/side) freestanding cube of...

So my neighbor is interested in electricity and magnetism. Well he's actually been watching youtube videos and thinks he can make some kind of free energy device. But anyways I thought it could be fun to do some real projects with him like playing with magnets, making a diy DC generator, and...

Can someone explain what exactly happens at (4) ? I do not clearly follow, except that there is some cosine law going on? I also do not really understand why at (3), r' doesnt have a z hat component, but I can live with that.

I find the current first, which is 2 A. Then the voltmeter reading would be 10 V - 1 x 2 = 8 V. But the answer is 12 V. I don't understand why it should be 10 + 1 x 2 = 12 V Thanks

Apparently, we need to integrate the functions from 0 to the time when it is fully charged. However, I integrated in terms of t so the soultion (according to a graph programme) should be around 236 Vs but I don’t see how this could help me.

If a balloon and a sweater are rubbed together, high-school science teachers like to say "the electrons transferred to the balloon in the form of static electricity." Then, it is often charming to show that two such balloons repel one another "because they have more electrons." Can we unpack...

Consider a large, charged, plate capacitor with a distance of, let's say, 1 lightsecond between the two parallel plates and also a plain cable of the same length. Everything is in vacuum. If I first connect one end of the cable to one plate and then connect the other end to the other plate the...

My static electricity meter won’t stay zero when I am not moving and when I am electrically grounded. Video: EDIT: Can you see this? shorturl.at/jsGV0

Hi, I recently read the following article on BBC online: "Revealed: Huge gas flaring emissions never reported (https://www.bbc.co.uk/news/science-environment-62917498)". Can they not use the ‘waste’ gas from flaring to generate electricity? Is it not feasible or economically viable? Do they...

1 In recent days I have done a few experiments measuring the current of water as it goes up from 9 volts up to 36 volts, and following Ohms law to convert it to resistance. And I discovered a very interesting trend. In between 9 and 18 volts, there is a massive drop in resistance (by around a...

I would like to let my 6 years old son play and learn about electricity or electronics. I have searched on the Internet and what comes out are mostly kits with an arduino or a clone, which are very interesting but not exactly what I'm looking for. I have seen a kit that teaches about electricity...

The idea is to wrap a balloon in several layers of material, similar to that used in electrostatic adhesion wall climbing robots, and run power through the layers. The electrostatic charge on the layers outside the balloon will build up and the air inside the balloon will begin to become...

Summary: I want to find out how much electric can be calculated from a certain amount of rainfall I am doing a project. I have estimated how much water I expect per month but I am not sure how to calculate the amount of electricity I expect to generate from this rain fall can someone give me...

Voltage SI unit = Volts Current SI unit = Ampere Resistance SI unit = Ohm Ohm's law : V=IR Did Georg Ohm (German), Ampere (French) & Volta (Italian) collaborated when Ohm came out with this electricity equation with units for voltage, current & resistance as per their surnames? Credit goes to...

I am comic fan There are several fiction character with electricity ability. Like Sasuke and Kakashi from Naruto , and Killua Zoldyck from Hunter X Hunter, they use membrane concept of electricity to cover their bodies, which helps the electric nerve pulses to run at the electrical membrane...