Questions tagged [electrostatic]

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2answers
83 views

Vaneless ion wind generator: isn’t the maximum output theoretically limited?

I was thinking more specifically about the Dutch model of the kind EWICON : https://en.m.wikipedia.org/wiki/Vaneless_ion_wind_generator Here is what puzzles me: If the wind is strong enough to carry ...
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1answer
56 views

Soldering iron resistance reading

I’m learning about electrostatic discharge and I’ve read that my soldering iron should have a ‘grounded tip’ which I think means its power plug should have an earth prong which it does. I took a ...
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1answer
44 views

Electrostatic causing interrupt trigger [closed]

I am using Atmega328P in sleep mode and for wakeup I am triggering interrupt with push buttons. Circuit working completely fine. PCB is surrounded by aluminum cylindrical body. Problem is when someone ...
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0answers
49 views

Why capacitor 3 loses energy as it induces current in other capacitors

plate B of capacitor 1 and 2 are connected to capacitor 3 to provide potential difference. Part A includes capacitor plate and dielectric. When part A and B are connected the positive charges will be ...
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1answer
50 views

What will be the steady state Charge distribution of given configuration- battery vs capacitor

I was try to figure it out what should be the charge distribution over the spherical conductor of radius R (in figure below) in following two configurations- Assumptions length of wire (l) connecting ...
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1answer
93 views

Ultra electrostatic capacitor generator

Part B of ultra capacitor 1 and 2 are connected to ultra capacitor 3 to provide potential difference. Part B includes charge collector and electrode. Part A of ultra capacitors 1 and 2 include the ...
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4answers
98 views

Generating current using capacitor

If you get a capacitor that is two plates and a dielectric and next to it you put two plates close but not in contact at opposite sides and the capacitor in the middle is charged, each of its plates ...
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0answers
58 views

Can a multi meter measure a potential static discharge?

Can a multi meter measure a potential static discharge like between hands and laptop before I open cover and replace a battery? Like if I touch laptop and my hands with the each two probes of a multi ...
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1answer
31 views

Electrical work sign convention

If I understood the correct sign convention it's as shown in the below sketch
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2answers
166 views

Trying to make an electrostatic battery charger

Can the DC layout charge a battery? I see as if it is in a solar cell format. I know that for a solar cell, when light hits the cell an electron is discharged but the semi conductor only lets it go in ...
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1answer
31 views

Signed or unsigned distance in electric potential due to point charge(s)

I am reading about the electric potential: from wikipedia: The electric potential (...) is the amount of work energy needed to move a unit of electric charge (a Coulomb) from a reference point to the ...
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2answers
58 views

USB digital microscope and ESD safety (maybe power supply problem)

I have an ESD mat, ESD wrist strap and a Chinese USB (power only) digital microscope(Andonstar ADSM201.) I use the microscope for soldering and inspection at home for hobby projects. The microscope ...
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0answers
34 views

Using method of image to find surface charge density

Two point charges of 50nC and -20nC are located at (-3,2,4) and (1,0,5) above the conducting ground plane z=2. Calculate: a)The surface charge density at (7,-2,2), b)\$\vec D\$ at (1,1,1) Now, ...
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0answers
61 views

Using method of image to find potential difference and electric field

A point charge of 10nC is located at point P(0,0,3) while the conducting plane z=0 is grounded. Calculate a) V and \$\vec E\$ at R(6,3,5) b) The force on the charge due to induced charge on the plate. ...
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0answers
256 views

Determining Electric Field on a Charge Plane

Question: A plane \$x+2y=5\$ carries charge \$\rho_s=6nC/m^2\$. Determine electric field at \$(-1,0,1)\$. My try: At first, I calculated gradient Let, \$\phi=x+2y-5\$ \$\begin{align}\\ \vec\nabla\phi&...
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0answers
41 views

How to check for the ESD protection of the capacitors

I have this circuit I need to check whether my input capacitors C0001-c0004 are protected for ESD events. My ESD pulse spec: +/-8kV, 2kohms & 330pF. I have taken 130% of this +8kV as my ESD pulse ...
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1answer
61 views

Electrostatic Discharge on new Workbench Setup

I'm setting up a table at home to do some electronics work (assembling microcomputer kits like the Maximite 2 and similar projects that require handling of sensitve IC chips). I have a desktop lamp ...
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1answer
136 views

Calculating the unknown charge using the \$2\$ remaining charges in this arrangement

The overview of the problem and the solution and my thoughts are as below. "/*" represents about my comment. We'll handle the \$3\$ point charges in the vacuum. Firstly the \$2\$ charges are ...
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1answer
37 views

Imagining electric flux intuitively

I know that electric field doesn't really flow, so whenever I'm trying to imagine electric flux like an amount of water passing through a window intuitively, I can't relate these two things. Can ...
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0answers
23 views

Boundary condition of electric field

I am unable to obtain the value of z component, Here is my attempt at the solution: I am going wrong somewhere. Can anyone help with this?
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3answers
124 views

Can an electrostatic motor produce constant torque at varied speed?

The idea of this question came from a DC motor that produces less torque by greater speed. Can an electrostatic motor produce constant torque at varied speed? How can I make a mathematic model of ...
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1answer
106 views

How it is determined whether an equal sign can be used within the boundaries?

Why equal signs weren't used for limits(r < a, a < r < b, r > b instead of r <= a, a <= r <= b, r >= b)? Two concentric spherical surfaces of radius a and b = 2a are in vacuum ...
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3answers
137 views

Can an electrostatic voltage be divided with very large resistors?

Is it possible to divide an electrostatic voltage from a Van de Graff generator or electrostatic generator with very large resistors?
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1answer
70 views

Charge transfer in conductors of different metals by touching

when we touch two metallic conductors one is neutral and other has excess of charges, Case 1- Both metals are of copper, then we can calculate actual charges on them at steady state by capacitance ...
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2answers
60 views

Static Electricity - and charges

When we comb our hair (with a plastic comb) and then bring the comb close to bits of paper, the bits get attracted to the comb. I understand this is because the comb is now electrically charged. Why ...
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1answer
34 views

Voltage boosting device for electrostatic experiment

I want to get 2kV to 6kV (adjustable) for performing electrostatic experiments with parallel plates. What device can produce such high voltages from the 230V mains? I watched a video on YouTube ...
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0answers
144 views

Electrostatic protection - input and output ESD protection added to op amp w/built-in ESD

I have an op amp circuit using the OPA2626 that has a built-in input/output ESD protection of +/-3000V human body model. The circuit is 3.3V single supply, non-inverting, with only an external ...
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0answers
109 views

What is considered ESD Sensitive and non-ESD Sensitive?

For example, if an integrated circuit has an HBM rating of 8 kV but is now embedded in a circuit board, which is now installed inside an equipment assembly, I would think the ESD susceptibility of the ...
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1answer
277 views

Harrington rod from spinal fusion might be acting like a human EMF antenna [closed]

In 1994, I had a spinal fusion surgery to correct Scoliosis which was a result of my medical condition, Spinal Muscular Atrophy Type II. I've used a wheelchair my entire life. Because my upper body ...
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1answer
44 views

Energy subtracted from a capacitor for a given voltage drop

I am trying to estimate, from a total energy of a capacitor (which is the output of a charge pump circuitry), how much energy do I have to power up an LED before the voltage goes below a certain ...
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1answer
74 views

ESD strap/mat when working on battery powered devices/PCBs

When the devices you're working on are plugged in an outlet or when you're working on loose components, it makes perfectly sense to ground yourself to the outlet or any other solid ground through a ...
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1answer
36 views

Voltages and charges with regard to ESD

My question is with reference to this question - ESD protection using a capacitor I am unable to grasp the relation between charge, voltage, and capacitance, although I can understand all these terms ...
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1answer
55 views

Protection against electrostatic paint by draining the charge

I have a circuit for an automotive sensor aimed for 24V supply. The circuit itself is well tested for EMC requirements including power line transients and EMC immunity. Usually the requirement is for ...
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1answer
55 views

When grounding conductors in electrostatic problems, is the reference point of electric potential defined at infinity or the ground?

I am confused about the meaning of 'grounding' in electrostatics. My textbook claims that any grounded conductor has zero electric potential, but it seems to me this claim can have two different ...
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0answers
43 views

Capacitance calculation of comb-drive actuator

I just want to make sure that I am performing this calculation correctly... From this COMSOL study, I gathered the following info... $$C_t = N\frac{\varepsilon_o\varepsilon_rl_ot}{d}$$ $$C_f = \...
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0answers
261 views

What is causing this weird effect with aluminum?

I grabbed an LED and then scraped an aluminum plate with a pin, and it turned on at some points, at first I thought it was electrified but it wasn't, then I tried with another aluminum plate and it ...
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2answers
37 views

Energising Electrostatic Charge Into Nylon Ribbons? Is it possible?

Forgive me for how high level this is but this is the goal I'm trying to achieve here: I want to build a device that has dangling ribbons of a material (lets say nylon for now) that can be actuated ...
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3answers
2k views

Is it safe to use hot glue in electronics?

I know question seems too basic to ask but I couldn't find any specific information anywhere . I want to use hot glue gun to stick components and cables into cardboard to prevent them move or break ...
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1answer
93 views

MOSFET Triggers with Electrostatic Energy

In the attached circuit with a 5V relay and a 30V load across it, I've noticed the FQP30N06L MOSFET triggers with even electrostatic energy (touching the gate). The difference between the circuit ...
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1answer
20 views

How do I measure material specific(volumentric) capacitance

I'd like to test electric capacitance of different powders pressed into solids. I want to know if my procedure is correct. First I connect a wire between the material and a ground (ex. radiator) to ...
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1answer
161 views

Gauss' law for two point charges?

When we model electric field as something that represents the "flow" of something that is conserved, we can prove that the flux due to a single point charge, through the following surface, Flux ...
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2answers
164 views

What is the energy density of voltaic piles?

I heard voltaic piles have very small power but long lifetimes so I was wondering what their energy density per unit volume and energy density per unit mass is. If specifying a type of voltaic pile ...
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2answers
84 views

How I can simply measure interwinding capacitance in a transformer with electrostatic shield

I want to measure which is the effect of the connection of the electrostatic shield (between primary and secondary) to ground (or to neutral) in reducing the interwinding capacitance in my transformer....
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1answer
85 views

Switching 1875 Volts through a relay

I am trying to create an electroadhesive device that I can switch on and off easily, however, after using one relay that worked beautifully to do this function, I went out and bought a 4 channel relay ...
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0answers
63 views

A conductive ball connected to a capacitor

I am not asking for a task solution, but rather how to solve a problem. Say I have a ball of radius R, charged to a voltage of U (relative to the ground). I also have a flat capacitor with a side ...
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1answer
130 views

Soldering Iron and Electrostatic Bracelet Connection

I have a DIY soldering station and I want to ground the soldering iron and I also want to use a electrostatic bracelet connector for the soldering station. Can you please help me how to connect the ...
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2answers
66 views

Something wrong with open USB circuit, electrostatic problem

I faced a strange problem with the following circuit. I'm using some buck converters and an Arduino. The buck converter (Vout = 5.25v) is for a USB charger (up to 2 Amps). Well, I think the circuit ...
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2answers
216 views

ESD problem on water tank?

We have a water level monitor attached to a water tank. The water monitor has an hydro-static (output 0-5V) water sensor that goes to the bottom of the the tank. (See figure) In most cases this works ...
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1answer
481 views

How to convert high voltage DC at low amps to low voltage DC or AC at high amps?

How to convert high voltage 500 volts DC at very low amps to lower voltage 12 volt DC or AC at high amps? Must I use an electrostatic motor or can I use an op amp? The reason I am posing this is a ...
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1answer
155 views

How to extract energy from an alternating electric field?

Given an alternating electric field E inside e.g. a big parallel plates capacitor, how can you make use of the field's energy to power an electronic device? So far I thought of putting two smaller ...