Questions tagged [charge]

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

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How to control current to charge batteries?

I have an Arduino project that is powered with a 1s battery pack (multiple 18650 in parallel). I use following module to protect against overcharge/overdischarge : https://aliexpress.com/item/...
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Solar charge controller

I have a question related to pwm charge controller .If I have 120W,22V PV pannel and i have to charge a 12.8V ,54Ah battery,which solar controller to use, pwm or MPPT?
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Charging board cuts out when unplugging USB cable

I’m using a Lithium battery charge/discharge board with 5V regulator and USB-C input to power a gaming handheld. It’s important that I be able to run the handheld and charge the battery at the same ...
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TP4056 STDBY or CHARGE COMPLETED PIN PROBLEM

I have charger circuit TP4056 based. My battery capacitY is 1100mAh(LIPO). Charging current is 580mA according to datasheet that has R9. While I am charging the battery, i read 0V from BAT_CHG pin. ...
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Equation for total charge time of a capacitor in a half wave rectifier circuit

simulate this circuit – Schematic created using CircuitLab For the above circuit I want to know if there is a formula that can give me the capacitor voltage as a function of time. I'm not ...
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How do Fuel gauge ICs compensate for battery aging?

I came across this Fuel gauge IC recently and although I understand how the SOC is determined, I do not understand how the age compensation constant(the one used to determine the actual SOC) is ...
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Discharging a capacitor into another capacitor via inductor

What would happen if you connect a charged capacitor (charged to V voltage) with another capacitor of same rating via inductor. What would happen ? Will both capacitors will have same voltage and if ...
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What is a charge on a conductive plate with a voltage between itself and a distant ground?

You'll find numerous examples of equations of capacitors and how to calculate the charge upon the parallel plates. But what is the charge on a conductive plate with a voltage between itself and a (...
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Is charging a capacitor to a new DC voltage fundamentally lossy?

There has recently been a question about switching losses and Landauer's principle entered the discussion. I included it in my answer because I believe, a capacitor fundamentally cannot be charged ...
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How to prevent body from influencing electrometer reading

I am setting up a lab involving a parallel plate capacitor connected to a 6V source and an electrometer. After disconnecting the voltage source from the capacitor, I attempt to find the charge stored ...
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Current density in an ideal pn junction diode

I found that the current density is as above. I am going really crazy with this problem as I can't get any clue from anywhere. I have been googling for 10 hours and have no idea. Please help. The ...
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Understanding the Formula for Amperage with Copper

From the beginning of Practical Electronics for Inventors: This makes sense to me up until the term $$1A = \left( \frac{1C}{1s} \right) \left( \frac{\text{electron}}{-1.602 \times 10^{-19} C} \right)$...
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Relationship between sample and integrate phase voltages in figure below

The picture below is from an old midterm paper I was trying to solve (I am no longer in grad school, just brushing up on concepts). The switched capacitor integrator below was given with the integrate ...
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Capacitor and loading effects

If there is a power supply charging a capacitor (e.g. 4 μF) through a resistor (3.2 MΩ), the time constant can be calculated with the capacitance and resistance. If I, however, measured the voltage ...
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Charging by electrostatic induction in a new way. Will it work? Instead of connection to Earth I am connecting to another conductor

I am adding the figure of a conventional setup for electrostatic induction. The drawn setup on paper is the special setup. If you don't want to read whole description then just read the summary. ...
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How can a conductor have voltage without charge on it? Taking in electrostatics [closed]

What does it mean if the potential of a conductor is Kq/r which is at r distance from the charge q? How can a conductor having no real charge have some potential (which is here KQ/r)?
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Why would the voltage at node X and P jump to infinity?

This is an excerpt from Razavi, Chapter 12 (Switched Capacitor Circuits) where he explains the benefits of turning off the switch S2 slightly before S1 (Fig 3), and how that helps the capacitor be ...
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Why is the energy in a battery QV, but the energy in a capacitor QV/2

If I know the total charge in a battery, let's say 5000 Ah, and I want to find how much energy is stored in the battery, I multiply the total charge by the voltage E = Q·V; for example, for 12 V I ...
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Why does a capacitor plate connected to Earth lose charge?

Can you please explain this to me? Is this correct? Why does the plate become neutral if the field outside the capacitor is zero?
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How does this circuit behave? (cap charge/discharge)

When I pulse, start signal should be at least 50ms HIGH before falling. To do this I must design R and C values to estimate capacitor C1 charge/discharge times. I get the schmidt trigger part, but I'm ...
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BMS adjusting charge current

I use this ready module for 3S battery group. Due to high charge rate (pull about 2-3A from power supply) a high current power supply also needs. I want to reduce charge rate up to 0.2C or 0.1C. No ...
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What is the physical model for energy flow in or around a lossless conductor during transient analysis? (Veritasium Electricity in Wires)

Context Veritasium - The Big Misconception About Electricity - Energy Doesn't Flow in Wires Note I do not agree with the answer (D) given by Veritasium which is only plausible if any tiny current ...
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How to choose capacitor voltage rating for ESD protection?

I understand the basic calculations on capacitors for ESD protection. In a nutshell the higher the capacitance the lower the final voltage will be because the charge of the ESD event will be "...
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What does charge on an electron mean?

As I have read , charge is electrons , protons or neutrons. Now , according to definition of current , current is the rate of flow of charge I.e flow of electrons. Then , I=Q/t . Unit of Q is coulomb &...
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Why does this solution say that "the total charge is" \$\Delta q\$, when \$\Delta q\$ actually is the difference/change in charge?

I'm currently studying the textbook Fundamentals of Electric Circuits, 7th edition, by Charles Alexander and Matthew Sadiku. Chapter 1.5 Power and Energy gives the following example: Example 1.4 An ...
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TP4056 - Charge while load is used with Zener diode

I'd like to add a zener diode to my tp4056 in order to be able to use the load while the battery is charging. Context: I found this post that looked promising however I lack electronics knowledge and ...
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How long does it take to charge up a capacitor

I am using Esp32 to control a NRF24L01 with antenna To power the solution I am using a HLK-PM03 which provides a 3.3V Output. I was thinking of using 470uF capacitor (other suggestions are appreciated)...
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What is current steering and charge steering?

'Charge Steering: A Low-Power Design Paradigm' by Razavi. I was reading the paper and came across these two terms.I tried googling but did not get a proper result, I have no clue what these are. Can ...
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Charges and a car battery [duplicate]

On face value so to speak when looking at a car battery, it can perhaps be easy to think that on the positive terminal being positive and protons are positively charged particle must be full of ...
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Adding mods around a TP4506 (Led indicator + use load while USB plugged)

This is my first post here, I'm looking to achieve some modification on my GBZ power part. I'm currently using: LiPo Battery 3.7V 4000mAh Micro USB charger TP4056 MT5608 Volt Booster (output 5V) I'd ...
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Battery voltage measurement

I am using a charging and discharging circuit to do operations with a Li-ion battery. When I charge the battery at 4.2V rated voltage and at 1 ampere current, I want to continuously measure the ...
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Charging lead-acid batteries via a boost converter. Are my calculations right?

I want to charge my two lead-acid batteries connected in series to a stair-case lift. I do not have a proper charger (don't have ebay/amazon here) but I do have a 19V, 3A laptop charger (SMPS). I also ...
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Charging 3.2V 6000mAh LiFePO4 batteries (32700)

I bought one 3.2 volt 6Ah LiFePO4 battery, which is called 32700: For charging, I have a lot of li-ion TP4056 charging modules, but I have read that these batteries differ from lithium-ion batteries. ...
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Why the border of 2 dielectrics can takes average energy density of electric field?

The ideal parallel plate capacitor exists and the upper space has been filled with the dielectric and same as the lower space. Each plate has been given \$ \pm Q \$ $$ \sigma :=\text{ surface ...
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Distribution of surface charges along the wire

Distribution of surface charges with a constant gradient is present along the length of the wire which produces a constant electric field along the entire length of the wire. This results in constant ...
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Using constant current and constant voltage charging to fully charge a battery

I did not find a thread which properly answers this question so I hope by asking this here I can gain some understanding and it would be here for later use, From what I understand, Constant current ...
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Static charge behavior (in ref to Grob's Basic Electronics book, 13th Ed, p33)

I have a question pertaining to the aforementioned book in a section titled "Potential between Different Charges". The paragraph goes as follows: When one charge is different from the ...
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First things to first, does charges moves as the switch is opened of this parallel circuit?

\$ V_{0}:=\text{initial voltage of } C_{1} ~ \text{as the given diagram(which means )} ~C_{1} \text{has been charged} \$ \$ \text{operationA := Close}\text{ switch1 and open switch2 and do charging ...
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5 V, 2A cable and audio cable run parallel into circuit board, board fries, how?

This is a sort of forensic electronics case, where a circuit board was fried and we are trying to understand how. Perhaps someone can help or at least be entertained by this question. I sent a sort of ...
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Multiple CC/CV charge controllers in parallel?

Can multiple cc/cv charge controllers (TS1052 for example, which is rated for 100mA drain current) in parallel configuration to achieve a higher drain current? (input signals also connected in ...
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What is the charge flow between a charged capacitor and an uncharged capacitor connected in series

What will be the charge on both the plated after bc is closed? (Imagine that both the C1=C2=C)
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How can i use my power supply ( 24VDC 5A ) in redundant mode ? I need to design it

In redundant mode, if one of my power supply goes off or faulty, my standby power supply shall overtake. I am thinking to use SPDT Relay (24VDC) both in Input as well as Output. secondary power supply ...
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How many newtons are there in one coulomb of charge?

Or, I should have said, how many newtons of force does one coulomb of charge exert? At a distance, presumably, of one meter? Since N/C is supposedly equivalent to V/m? P.S. What are the values for a ...
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USB Type-C split to fast charge PD and use with car Android Auto

OK here is the image of the device and it is working, like users posted. There is one problem though, I cannot buy it anywhere. I want to make it out of cables directly, without using the board. I ...
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Charge injection Compensation for Demodulation

I have a precision application where I am trying to limit the charge injection on an analog mux that is demodulating a sine wave from 0deg and 180deg components (with a trigger signal from a ...
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The effect of grounding a simple circuit?

Suppose I have a simple DC circuit consisting of a battery of voltage V (no internal resistance assumed), and a resistor (resistance R) connected in series by conducting wires. Because the wires are ...
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Lead acid battery for embedded system

I am developing an embedded system that contains a 12 V lead-acid battery. The system is developed for 12 V vehicle applications, also using a 12 V lead-acid battery. I am not so sure how to connect ...
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3 votes
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How do I determine the resultant permittivity of two different dielectric materials in a cylinder capacitor?

I am trying to calculate the density charge of the inner cylinder in the above picture. If there was only one dielectric I would use the following equation: $$ \frac{q_{enc}^f}{L} = \frac{2\pi \...
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What kind of gps battery can I use for uBlox NEO-M8N GPS module?

What kind of gps battery can I use for uBlox NEO-M8N GPS module? Would you please recommend gps battery? and Which can I use 5.5mAh or 11mAh?For example; MS621FE-FL11E - BATTERY LITTIUM 3V 5.5MAH (...
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Capacitor in presence of an external electric field

Let's consider a capacitor made of a couple of parallel metal strips (suppose they are made of perfect electric conductor) as shown in the figure, which represents a little capacitor. Suppose an ...
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