Charging Definition and 407 Threads

First let us talk about a case where the battery gets discharged, I have a circuit with a battery and a load. The emf of the battery is 6V and the potential difference is a little less because the battery has internal resistance. When a charge moves from the anode and reaches the load it loses...

This is related to an earlier post (https://www.physicsforums.com/threads/an-electrolytic-capacitor-charges-by-itself.1008156/), but there's a new angle to it, therefore the new thread. I have two 100 microF electrolyte capacitors in my office, one is connected to a volt meter, the other is...

I'm reading the capacity chapter of Serway's book, and I had a question about the charging of a parallel plate capacitor. Let's assume the following situation with a modification of the circuit in the figure: we connect the negative terminal of the battery and one of the capacitor plates to...

I'm trying to understand the load-resistance of an A123 Nanophosphate High Power Lithium Ion cell. https://www.buya123products.com/uploads/vipcase/844c1bd8bdd1190ebb364d572bc1e6e7.pdf My understanding is that resistance increases as the cell charges. The datasheet says "Internal Impedance...

I would like to know when a alternator is charging a battery is the current flow a series opposing circuit......?

I understand that electrical conductivity is a measure of how easily charges are able to move in an object. During charging by conduction (for conductors), it seems that we simply have to add the charges of both object together and divide by two to obtain the resultant charge of either object...

Why does rubbing two objects together produce a different result than having them contact?

I am not sure if the explanation below is enough. This is a high school level question. When rubbing occurs between glass and silk, then heat energy is produced which provides the energy needed to free up electrons in outermost orbits of atoms in silk or glass. But silk has very tightly bound...

If the statement above is correct, I do not understand this concept. I guess by charging my phone I am not producing matter. Does it mean in this case, energy converts to mass (not matter)? Can someone please explain this?

Question 1: a. I am aware that the general equation for capacitance is C=Q/V thus Q=CV. 22 μF = 0.000022 or 2.2*10^-5 F Would the charge stored by equal to Q=2.2*10^-5*12 Thus, Q=2.64*10^-4 C b. The energy stored by a capacitor is given by E=1/2QV=1/2CV^2=1/2Q^2/C I think with the information...

So I can charge my iphone, with the 61W macbook charger using the USB-C interface. I think the battery won't draw more effect than it needs/is dimensioned for, so this works fine. Can i use any charger with an USB-C interface to charge my iphone? or does it only work with apple products? Or...

If charging some smaller toy, phone, electric razor, toothbrush or the like with induction charging I assume that the speed (time it takes to charge an empty battery) will depend on 1. the battery to some extent, but for this sake let's omit that 2. the inductive charging it self 3. wall socket...

I have a source of electricity that's alternating but at variable frequencies. So an asynchronous alternating current of sorts if you will. Can industrial rechargeable batteries be charged like this efficiently? Or would DC current work best? Or normal AC?

I am designing a hydro power system that will tie into an off grid solar system. I will be using a 48v carbon AGM battery bank. Will be using the Sol-Ark 12kw inverter/charger, which has 2 built in MPPT charge controllers for solar. Assume the hydro power will be around 5 kw potential, and...

I need to build a battery system to drive a 10 HP pump motor. The actual BHP varies as the pressure in the system rises, but for the most part we are operating at a 10.1 brake horsepower. Run time requirements will vary from a few hours to many hours. I settled on 8 hrs as a basis. Motor...

A typical off grid solar system looks like this: PV Array -> MPPT controller -> Battery bank -> 240v AC inverter -> loads Suppose that the system is currently float charging: "Float charging, also called trickle charging, consists of charging the battery at the same rate that it is...

My tablet is IKALL N9 .Recently,I started facing problem connecting it to the charger so I would adjust the charger a bit until it would show charging .But a few days back it stopped charging altogether.it won't show the charging sign neither with AC source nor the power bank.I even changed the...

An electric car has, say, a 50 kWhr battery. 1. How much electricity, in kWhr, is needed to add 1 kWhr of stored electricity to the battery? 2. After several years, the battery capacity has, say, fallen to 25 kWhr. How much electricity, in kWhr, is now needed to add 1 kWhr of stored...

Can secondary cell can be described in circuit simulator?? With other symbols like capacitor. Also I wonder if there's a program that provide secondary cell(like Li-ion battery). Please help me

Hey, I just purchased a lipo battery and was wondering if I wanted to charge it would I be able to use a 6v/3amp charger for the following lipo 7.4v/10amp. I'm pretty sure I would be able to. LIPO BATTERY: https://www.robotshop.com/ca/en/74v-2000mah-5c-lipo-battery.html What is the general...

What is the fastest circuit to charge a supercapacitor?? could you show me??

The EMF of the cell is the potential of the cathode subtract that of the anode, consistent with ##\Delta G = -nF\varepsilon##. If the cell is running as a galvanic cell/discharging, the EMF should be positive. If it is charging, the cathode (the one gaining electrons) is now negative and at...

A standard example consider a capacitor whose parallel plates have a circular shape, of radius R, so that the system has a cylindrical symmetry. The magnetic field at a given distance r from the common axis of the plates is calculated via Ampere's law: \oint_\gamma {\mathbf B} \cdot d{\mathbf...

What sort of limits would be encountered if you tried to charge a magnetically levitating sphere to as high a voltage as possible in an ultra high vacuum by using an electron beam aimed at the sphere? Assume the sphere is highly spherical and polished. If electrons have sufficient energy to...

Sorry if this is an absurd question. I'm recently been playing with alcohol inks and noticed certain pigments seem to repel and apparently attract each other and create interesting patterns under the right conditions. e.g. non absorbent substrate with no 'tooth.' So far this has worked best...

Hi. Could anyone guide me as to what equipment and considerations I need for maintenance charging a battery bank used as solar storage. The bank consists of 8, 6v deep cycle lead-acid batteries (Rolls batteries: S6- GC2-HC) The solar system is for a seasonal application and the shed they...

I am researching the electrochemistry of redox flow batteries, however, I do not understand the charging process. As I understand DC current arrives in an electrode and transfers energy to excite electrons in the electrolyte thus providing energy to trigger a chemical reaction (storing...

I have a simple 12vdc system on a boat with a single battery bank. There is a stock alternator on the engine and I've inherited a solar panel i'd like to install. I understand that most solar charge controllers have built in back feeding prevention, but will i also need blocking diodes on the...

Assume that a resistor R charges a capacitor C, whose other terminal is connected to the ground. The charge at time t = 0 is assumed to be null and the supply voltage is equal to V. We have, as is well known, ##i = \frac{V}{R} e^{-\frac{t}{RC}}##. Integrating ##\frac{i^2}{R}## between t = 0 and...

Homework Statement [/B] A car battery with a 12v emf and an internal resistance of .040 ohms is being charged with a current of 50A. A.) What is the potential difference across the terminals? B.) The rate of energy dissipation in the battery Pr. C.) the rate of energy conversion to chemical...

Is it feasible to recharge satellite's batteries utilizing a ground-based laser?

In an LC circuit, the capacitor that is initially charged to a finite value starts to discharge cross the inductor, initially the current increases and the inductor opposes it, but as the current is supplied against the back emf, due to the discharging of the capacitor, won't it reduce the value...

So the work done when charging up a capacitor is ##dW=VdQ## However, when we add a charge ##dQ## to the capacitor, ##V## also changes accordingly, so I was wondering why the work done wasn't written as ##dW=VdQ+QdV## (one that also takes into account t he change in ##V##). Thanks in advance.

Homework Statement Homework Equations CMRR = Av/Acm Acm= Δ/R , Δ = (2 x Tolerance of Resistor).R The Attempt at a Solution I have to admit I am a bit confused by the premise of the problem. My understanding is Vout is used to vary Vcharge in some way, so that Icharge is always 1.3 A. Then...

I'm sorry if this question is a little abstract, but would appreciate any guidance! It's for a DIY project I am considering. Suppose you have a flat panel mounted on a wall, and a very strong magnet that will move in any direction on the plane of the flat panel. Through any possible arrangement...

Let's say both battery have the same charge capacity of 3Ah Battery A has voltage of 3V and B has voltage of 6V. Battery A is completely discharged while B is completely charged. If I charge battery A with battery B, wouldn't B be completely drained because they hold the same amount of charge...

Hi could some one please explain Charging of tRNA (for dummies) ? Like i wanted info of the enzume complex during amino acid attachement and how the acceptor arm and CCA accepts the amino acid.

So cars usually specify the batteries in kWh (rather than Ah). So given that i know the kWh capacity of a car. I also know the charging effect in W (i.e. the voltage and amps in my charging station). Can I reasonably estimate the time it'll take to charge the battery? It doesn't have to be...

Hi all, I'd appreciate help in calculating the voltages in the circuit shown. I thought it should be fairly straight forward, but it has me stumped. This is a sample-and-hold circuit for an ADC -- the switch is closed to charge the hold capacitor with the sample voltage and then opened to...

Suppose a spherical capacitor is being charged. In this case the E field between the plates is growing with time which implies a displacement current which in turn implies a B field. How would one find this B field if it does exists? I'm guessing the B field is zero because of symmetry. I...

See attached photo for circuit diagram. The switch S has been open for a long time. Determine the magnitude of the electric charge stored by the capacitor. Use the following data: C = 3.43 mF, ε1 = 11.0 V, ε2 = 31.9 V, R1 = 3.66 Ω, R2 = 5.04 Ω. I understand how to determine the magnitude of...

Hello everyone, Recently, I bought a R/C Helicopter which has a 7.4V 850mAh Lipo battery. I enjoy flying it in the field but I have a problem charging its batteries after each flight. I have no access to any car battery or 220V wall socket. I bought a Lipo charger for it which needs at least...

hi, i tried to simulate a simple capacitor and resistor charging circuit like this i used an imaginary resistor value "10M ohm" the result as you see appear to be strange, why this happened? is capacitor's charge is relative to the voltage on the capacitor it self? and i need some...

Okay...Is it possible to charge a metal, by conduction, using only a single terminal of a battery?...Like it we touch only the negative terminal with the metal, is it going to get a negative charge??...If not, then why?

Since positive charge on the photocatode increases work function of electrons, does charging metal photocatode negatively decrease work function? If not, why?

Hello everyone, I'm a RC helicopter enthusiast and want to fly in the field where there is no AC wall socket available for charging the helicopter's battery. The helicopter's battery is a 7.4V 1500mAh Lipo (11.1 Wh). My car's battery is 12.65V 74Ah. There is a charger available for charging...

Can someone explain how someone was electrocuted while wearing earphones from a phone that was being charged ? https://www.thaivisa.com/forum/topic/1011361-construction-worker-dies-while-charging-his-phone-at-chonburi-rooms/

Hi All, My Dell Inspiron with Win 8.1 is plugged in but it is not charging. Please see screenshotsof power settings 1) https://www.physicsforums.com/attachments/2149932) https://www.physicsforums.com/attachments/214994 There was a post on this , but it did not answer the question. I am trying...

Homework Statement 1. The characteristic decay constant for a capacitor C discharging through a resistor R is the product of R times C. If the initial voltage at time t = 0 is Vo = 13Volts and what is the voltage at time t = 2RC? 2. A capacitor C = 9microFarads is charged from 0Volts to...