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Questions tagged [charge]

A fundamental physical property held by various particles, most notably electrons

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How to re charge Aquion batteries? [closed]

My S20-008F Aquion Battery stacks are below minimum charging voltage (30V) via Sol-Ark Inverter. Can I use a 12V charger on each stack individually?
Richard Pechner's user avatar
1 vote
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Resistances to two batteries where the bat1_pos + bat1_neg = bat2_pos + bat2_neg? But, bat1_pos is shorter than bat2_pos

SOK makes a unit called "12-Slot Outdoor Insulated Battery Rack – Fits SOK & EG4 Batteries" In this configuration there are two batteries next to each other stacked six sets deep. Both ...
Evan Carroll's user avatar
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2 answers
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Can I integrate \$v_y(y) \$ in Meyer model for MOSFET? [closed]

$$ I_D = -W \cdot Q_N(y) \cdot v_y(y) $$ Re-write equation in terms of voltage at location y, V(y): $$ v_y(y) = -\mu_n \cdot E_y(y) = \mu_n \cdot \frac{dV}{dy} $$ $$ \Rightarrow \int dy = \int \mu_n \...
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How is channel charge calculated in meyer model?

The following is from MOSFET Circuit Models. $$ q_N^v(v_{GS}) = -w \int\limits_0^L C_{ox}^c(v_{GS} - V_{Tn} - v_C) dy \\ $$ Recalling that current is related to the electric field $$ \begin{align} dy &...
kile's user avatar
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MOSFET Total Gate charge graph (Qg)

Below is a Vgs -Qg graph of the IXTH88N30P N-channel MOSFET. Datasheet: https://www.mouser.com.tr/datasheet/2/240/media-3322045.pdf As seen in the graph, this curve is given for Vds = 150 V, Id = 44 A ...
Mhan's user avatar
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What type of device is this on TP5000 Application Exapmle?

Data Sheet (Chinese) Question 1 Component N1 looks similar to a mosfet but doesn't look like other ones that I have seen for N-Channel. What is this component supposed to be? This example is for LFP ...
sdolan's user avatar
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3 answers
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Charge "something" over a 10 second interval then dump the charge on a load. (Alternative to battery?)

I'm getting a limited current of about 10 mA from a 12 V DC source. I would like to charge "something" (anything but a battery) with this energy over 10 seconds, and then dump it to a 12V ...
zdanman's user avatar
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1 answer
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Piezoelectric Disk Charge Generation and Detection

I have a piezoelectric disk. I am trying to determine the sensitivity of this disk for the sake of making a charge model more accurate. The charge model in question: I have attached the piezoelectric ...
HFOrangefish's user avatar
5 votes
7 answers
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Why is capacitor equilibrium based on balanced voltages and not balanced charges?

The problem below is from the electrical circuits chapter of Essential University Physics Volume 4. I am having trouble understanding the essential idea behind the solution. I initially tried solving ...
Saveer Jain's user avatar
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1 answer
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Estimating lithium-ion battery run time at different voltages

A polymer lithium battery in a powerbank (marketed as 30,000 mAh / 3.8 V, 114 Wh), has an actual electric capacity of 19,944 mAh, and an energy capacity of 104 Wh as measured with a constant load ...
user3026965's user avatar
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1 answer
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Signal conditioning of a piezoelectric sensor

I am currently working on a project that involves the use of a piezoelectric sensor which is of the ceramic type and produces charge when a force is applied. I want to convert this charge to a voltage ...
Hannan Ayub's user avatar
1 vote
5 answers
135 views

To what voltage will this capacitor charge?

To what voltage will the capacitor in the circuit here above charge? The circuit is fed by 10V DC. I=U/R=10/100k=0.1mA Voltage drop on the 10k is 1V. Will the capacitor charge to 9V or to 10V? Someone ...
Jan's user avatar
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How is the total gate charge of a MOSFET affected by the temperature?

For P- and N-MOSFETs, Vgsth will decrease (in absolute value) when the temperature rises. What is the impact of the temperature on the total gate charge for P- and N-MOSFETs? What is the order of ...
Rémi Baudoux's user avatar
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1 answer
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Engine instrument panel with duplicate Charge light, one incandescent and the other LED [closed]

I have an engine in a boat. The ignition on switch, start, and heat are on a panel on the navigation desk. There is also a power LED, incandescent charge, and led oil light. All the engine instruments ...
Fiona's user avatar
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Can I charge laptop with wire 20awg

My laptop has a maximum power is 170W, 20V, and I often use it with max power. My adapter has a broken power jack and I must change the wire that supplies power for the charge. I use wire 20awg, the ...
Trà Nguyễn's user avatar
5 votes
4 answers
2k views

Why are smoothing capacitors useful/why do they work

Okay so from my understanding and looking at the equation for the impedance a capacitor has, the high frequency signals would be relatively easy to be sunk to ground (if the capacitor was grounded) ...
George kirby's user avatar
1 vote
1 answer
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Using two TP4056 modules to charge two cells in series

Here's an attempt to get use two modules of charges to charge and protect each of its own batteries connected in series. Adding back-to-back P-mosfets and a shottky diode converts the whole system ...
Benzine 's user avatar
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1 answer
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Calculate capacitor charging constant time connected to battery and boost converter

I know the formula to calculate the constant time for capacitor is t=RC and for full charge t=5RC. In the following example there is not resistor in the circuit but of course we are not in the ideal ...
Ahmed Mohamed Hassan's user avatar
1 vote
2 answers
329 views

Designing a Charge Amplifier Circuit in PSpice for Piezoelectric Sensor

I'm new to using OrCAD PSPICE 16.6 and need some help. I'm trying to design a charge amplifier for a piezo sensor before building the actual circuit. I've chosen a VSIN source as my input to represent ...
meadow's user avatar
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4 votes
2 answers
303 views

What is the charge stored in the equivalent capacitance?

Three capacitors C1, C2, and C3, whose values are 10 µF, 5 µF, and 2 µF respectively, have breakdown voltages of 10 V, 5 V, and 2 V respectively. For the interconnection shown, the maximum safe ...
dijkstra's user avatar
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119 views

Delay-Free Switched-Capacitor Integrator Difference Equation Derivation

I want to derive the difference equation of a delay-free SC integrator using charge-domain analysis. Here's the example I am following. This shows you that for charge domain derivation, all you need ...
Leonhard Euler's user avatar
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Will the laser beam of a laser printer make the OPC drum more positively charged or more negatively charged [duplicate]

while I was tutoring students about A LEVEL computer science in chapter 3 -- hardware, I found a very interesting question about printer. Some websites say that the laser beam could remove charges on ...
Jack don's user avatar
1 vote
1 answer
140 views

Why is resistance (inversely) proportional to area instead of circumference?

TL;DR From the Veritasium-vs-ElectroBOOM debate about the 1 m / c question, it seems to me that most properties about conductors depend only on surface charges. So shouldn't quantities like resistance ...
eccentricOrange's user avatar
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1 answer
158 views

Propagation speed and capacitors charging speed of transmission line

I am a bit confused on the speed of voltage propagation in the transmission line and I hope someone can enlighten me. I understand the speed of step up voltage propagation is in the same order as the ...
eyew18's user avatar
  • 1
4 votes
2 answers
175 views

Electric field of line charge and coaxial conductor

I'm currently having trouble understanding why the electric field inside a coaxial conductor (assuming that the charge is evenly distributed on the inner and outer conductor and opposite signed) is ...
Janik's user avatar
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1 vote
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193 views

Using an RC delay circuit on a MOSFET Gate

I have 24v Input from push button, I want to make delay when I leave the button and the PMOS will stay on for about 0.6sec. Attaching some timing diagram for the required operation signals (pay ...
Knowledge's user avatar
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1 vote
1 answer
112 views

Strange capacitor charge / discharge oscillations - SPICE

With this setup ngspice produces, for an 1ms dip-to-zero spike, this output Voltage source pwl(0 15 1m 15 2m 0 3m 0 4m 15 5m 15 2 15) r=0 If I make ...
kellogs's user avatar
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Solar panel help

I already have a solar charge controller connected to my solar panels protecting the attached batteries from overcharging. However I'd like to charge a second battery bank without connecting it up to ...
Mike's user avatar
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0 answers
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DS3231 module li-ion charging circuit tweak

Most of the DS3231 modules come with a "charging" circuit for a LIR2032 battery. I understand that, as-is, it's considered garbage. The reason people say not to use the module as-is is due ...
Mike Anderson's user avatar
1 vote
1 answer
93 views

Transient Charge Density in Conductor

Veritasium's (Derek Muller's) video How Electricity Actually Works makes the claim at 4:44 that: The truth is, if you average over a few atoms, you find the charge density everywhere inside a ...
Math Keeps Me Busy's user avatar
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1 answer
107 views

The two capacitors are in series but positive end of one plate is connected to positive end of the other

Like the title says, my task is to find the initial voltage across the terminals. The two capacitors are in Series with positive end of one plate connected to that of another. The given information ...
RK Eshat's user avatar
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2 answers
72 views

Calculating charge current of a bypass capacitor, choosing series resistance

I'd like to switch power supply of two sensors, each of them with a bypass capacitor at their supply pin, with an ATmega328P MCU output pin with an absolute maximum rating of 40mA. The sensors ...
Torsten Römer's user avatar
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0 answers
79 views

Optimize a design for current/charge oscillator

I'm trying to understand how to design a circuit that cycles charges between two capacitors between cycles. Basically I want a large positive current pulse into one cap at the same time a large ...
lurscher's user avatar
  • 149
-1 votes
1 answer
136 views

Transformer in a 2-3A charger

I have opened one of my phone charger to check the transformer used to provide an output of 2-3 A. I am a bit surprised regarding the size of the transformer. It is very small and the wires in the ...
user avatar
-1 votes
3 answers
64 views

How is charge limiting achieved in laptops? Why does it cause heating when limit is reached?

Laptops have this feature which allow you to limit battery charging to up to a certain percentage. Electronics wise, how is this charge limiting achieved? Is there actually a proper relay cutting off ...
everythingtrashthesedays's user avatar
0 votes
1 answer
87 views

Cheap China solar water pump kit only runs for 10 minutes [closed]

I checked everything with a multimeter, everything seems fine. The batteries charge to full capacity. The output from the solar panel seems correct. The output from the controller seems correct. In ...
Matthew Nisbett's user avatar
0 votes
1 answer
71 views

Charge on capacitors in circuit

I have this circuit with defined components specifications: R1 = R2 = R3 = 100 kΩ C1 = C2 = 1000 μF C3 = 4700 μF U = 24 V First question is to calculate the charge on each capacitor. I managed to do ...
Matjaž Meža's user avatar
1 vote
1 answer
240 views

What is the total charge Q of 1 m³ of copper?

I was wondering if I can calculate the total charge Q of 1 m3 of copper, see my calculation in the picture below. Is this correct? The correct solution (thanks to the community in the comments below):...
Marco Moldenhauer's user avatar
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0 answers
51 views

Calculate potential between two rods

Suppose we got four thin, long and parallell conductors with charges shown in the image below. Each conductor has a radius \$ r\$ and length \$ l\$ . Our problem is to find the potential between the ...
Tanamas's user avatar
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1 vote
6 answers
1k views

Why does a smaller capacitance equate to a larger voltage drop physically?

I was hoping someone could explain practically/physically why a smaller capacitance has a larger voltage drop than a higher capacitance. The equation is V=Q/C, so based on that it's very easy to see, ...
Justin Montego's user avatar
0 votes
0 answers
71 views

How to make parallel piezoelectric/PVDF transducers for force measurement?

I am having difficulty in understanding a concept since I am not in the electrical field. I am working on a project to measure the dynamic force on a surface using embedded PVDF transducers. Based on ...
Ali's user avatar
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1 vote
2 answers
102 views

Making a powerbank using lead-acid batteries [closed]

I have three 12 V, 12 Ah deep-cell lead-acid batteries wired in series that were used for a scooter. I’d like to repurpose this battery pack into a powerbank that can be used to charge electronic ...
Andrew's user avatar
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0 votes
0 answers
45 views

Is this charge pump analysis correct?

Assume switch on resistance is 0. Also assume that phi1 and phi2 are non overlapping clock signals and that the initial condition of all caps is 0V. My final answer suggests that Vout/Vin is 2 only ...
AlfroJang80's user avatar
  • 3,145
5 votes
4 answers
2k views

Reasons to use charge amplifier?

Here are some preliminary information before asking the question: When piezoelectric force sensors are subjected to a stress, they produce a charge that is proportional to the force. The amount of ...
floppy380's user avatar
  • 1,885
-1 votes
3 answers
335 views

What's the difference between electricity charge and signal?

To better understand the difference between electricity charge and signal, I would like to know in which kind of case is electricity charges actually used, and in comparison, in which kind of case is ...
DevonDahon's user avatar
0 votes
1 answer
91 views

Which drains first when connecting Battery A -> Battery B -> Load? [closed]

I have two large commercial USB batteries I need to combine to produce power for a 10hr period. Each alone can power my load for ~6-8 hours. Reading a few other articles: Can batteries be charged and ...
David Parks's user avatar
0 votes
1 answer
155 views

RS310 DC power supply charging 12 volt car battery

I am trying to charge a car battery with a Rockseed RS310P power supply. I set the voltage to 14.5 V and the amps to 2.0 A but when I connect it to the battery and turn it on the current drop to a ...
ds1234's user avatar
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0 votes
0 answers
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Battery capacity evaluation

To measure NiMH battery capacity, everything I've read so far indicates that in order to get an accurate evaluation you have to measure the discharge parameters. I can understand that, however in my ...
Philip Grimado's user avatar
0 votes
1 answer
173 views

Switched capacitor circuit - polarity of charge

Consider the following situation: There is a capacitor C1 (polarity does not matter). The 'top plate' of the capacitor is the one at the top of the diagram and has two ideal switches connected, one ...
AlfroJang80's user avatar
  • 3,145
0 votes
3 answers
101 views

Is there a force when electrically charged particles are around DC current?

Is there a force when electrically charged particles are around DC current? I mean that if there are statically charged plastic particles in the switch, is it easy to move into the contact or not due ...
Ahn JIn Ho's user avatar

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