Battery Definition and 1000 Threads

If a potato ( or any other food, for that matter) is used as a battery by say, simply inserting two different metal pins in it and connecting it to a load, then does it reduce the nutritional value of potato ? or does it affect the potato negatively in any way ?

Hi.. i am working on a developemnt of electric vehicle as my final year project..i have calculated the max. power required by 800 kg vehicle is 30 kw.. so i am using 30 kw 3 phase AC induction motor.. now can you please help me out in sizing my battery pack.. weight : 800kg max. velocity : 80...

Hi, I am just clueless about this. I turned my computer off with the battery at 100% ( I was using power cord with outlet). I disconnected from the server at the coffee shop, went to " Shut Down" on Windows icon menu, turned machne off. This morning I turn my PC on and the battery is at around...

I have once again come across a smoke detector which requires not only a specific type of battery (9V alkaline) but also a specific model (in this case Duracell MN1604) to be used. I had a similar problem with a CO detector about a year ago (which came with a list of about 10 models that should...

I think max. voltage of a mobile battery is 4.3 V and voltage of a USB charger is 5 V; My question is , if we keep the charging process on even after mobile battery is 100 % charged, is it true that it will damage the battery ? Does it reduce the life of a battery or does it reduce the charge...

My cheapish 12V battery charger suffered an overcurrent, and now is not working properly. Below is a schematic of the main power side: The MOSFET M1 will not turn on, which I'll tackle later, but even with the drain bridged to source the voltages are wrong. The black, slow charge (rail at...

Why are these batteries stated as 12V batteries if often they have a reading of greater than 12V e.g 13 or 14 and when you rev the engine hard while in neutral and do a voltage test on some components in the car circuit you get a reading of much much greater like 40V! How is this working? Could...

Hi For a 1200 watt tool, there are 20, 40 and 60 volt batteries, and in the case of a 2 amp hour (7200 Coulomb) battery, using energy = charge x voltage gives different values of stored energy for each of the three batteries, which are 144000, 288000 and 432000 Joules. Is this correct? Thanks

I am thinking there is about 1/2 kilowatt hour of usable electricity in an 800 cca 12 volt car battery after conversion is this right?

Homework Statement Can we consider an inductor as a battery of emf ξ = -## L \frac {dI } { dt} ##? For the above circuit, ##V_A - V_B = V_C -V_D \\ -L \frac {dI } { dt} = IR ## Here, the inductor is acting as a battery of emf ## -L \frac {dI } { dt} ##. For the above circuit, ##V_A - V_B...

Homework Statement Calculate the value of the current through the 12 V battery shown in FIGURE 3. attachment-php-attachmentid-41345-stc-1-d-1322543216-jpg.147932 Homework Equations KCL KVL The Attempt at a Solution So, I1+I2=I3 [/B] Loop A (Left hand loop): +13-3*I3-12-I1=0...

Homework Statement I measured a battery rated at 1.5V(ε) and get 0.9V out and want to calculate the internal resistance (r). So, I model the battery as an ideal voltage source and a resistor in parallel. I know the voltmeter has a resistance of 1kΩ (R). How do I calculate the internal...

Can you immerse an electrolyte in an external electric field such that the ions are separated to a point that you could introduce electrodes and produce current in a load solely by virtue of the established charge distribution without electrode chemical interaction or galvanic potential as shown...

Hi.. I have a 40 volt (2.5Ah) , Lithium Ion battery. I need to use this battery for 20V application as well as 40V application. How to make an automatic voltage level chooser module for respective application?

I have solar panels fitted, with a capacity of 2.4 -2.5 kW. I am considering buying lithium battery storage for evening use. What would be the largest battery system I could charge from this setup?

If I had a mechanical rotating device rotating at 700 rpm connected to an alternator producing approximately 700watts; could I generate 2400watts if I were to attach 4 of them in series or parallel? Would that power be sufficient to recharge a 60kWh lithium battery that uses 27kW in 3 hours...

if a cell is running down, there would be a constant drop in p.d. across the cell, does the internal resistance of the cell increase or decrease?

I am aware of laminar flow but would like to look for some other ways. Is it possible to block ions from flowing in the "wrong" direction by applying a magnetic field to the electrolyte and let neutral molecules pass through?

Hi, Interested in sizing some DC lithium-ion batteries (through a controller) to power the following system: 90KVA, 200/115 Volts AC, 400 Hz, 3-phase. The current approaches I've taken have been drastically oversized so I'm clearly missing something. Cheers, J.

There is an interesting video @ Facebook about a potato that is made into a light socket & battery: https://www.facebook.com/HECHOenNUEVOLEON/videos/vb.1388218328082289/1950024855234964/?type=2&theater Now, I see how the generation of energy is done in the way that a "lemon battery" is done...

Hello all. Thanks for taking up your time to read my post. I have a device that operates with 3.2 V MAX, and I wish to power it from a standard 3.7 Li-Ion battery. A fully charged battery=4.2V. I used a simple LM317AEMPX (datasheet )circuit to drop voltage to 3.2V and it worked perfectly. Now...

It's mid summer and I think I need a project to keep busy. What better than a solar project? Problem is, I've never built a solar circuit before, let alone a battery charger. Ideally, I would like to build the equivalent of a solar powered generator. I know there's no way I'm getting as much...

Hi guys I'm creating a prop that's probably going to have a 7,4V 5000 mah 45C RC Lipo battery in it, and I'm planning to keep it permanent in the prop with a charge circut to charge it up with usb perhaps. I've thought of using a tp4056 circuit I have laying around and it seems like the...

Hello I need a bit of some help here. I have a Nintendo 3DS and I'm trying to get my program to display its battery voltage. The thing is the voltage function that Nintendo uses returns values in an unknown format, and I don't have access to a multi-meter to get the correct readings right now...

Homework Statement Determine the heat loss in the circuit that is connected in series with two batteries (12 V and 6V) and two resistors (6ohms and 4 ohms). Homework EquationsThe Attempt at a Solution I used the difference in P = V^2/R, the power dissipated in the circuit, to calculate the...

Homework Statement before that, can you tell me about "current flow in this circuit" if : A. the switch is open B. the switch is closed the Question is No. 1 Calculate the resistance of R if the value of the current I in the figure is 0.50 A. ( i think it is related to no 2) no 2. Calculate...

I have a large array of solar panels, which are 12v panels. I have wired them two each in series to produce 24v at the array and carry that to a 24v charge controller which then connects to two 12v batteries wired in series for 24v, to power a 24 volt inverter. But I have observed a problem...

If a small voltage - say 1V, is applied to the negative terminal of a 1.5V alkaline battery (although I don't think the type of battery matters?) will this create a current between the 1V and the negative terminal until the charges are somehow balanced? If not, what will this situation do to the...

Hi, I want to run a cheap 5 meter led strip along the inside of my boat for cool night lighting. It will be powered by a 12v deep cycle battery. I was hoping y'all could double check what I was thinking before I set something on fire... Here is the led strip...

Hey there! I'm an IT guy and found this forum through searching on replacing UPS batteries with deep cycle 12v marine batteries. The reason I was looking is I happen to have 4 spare Compaq rack mount UPSs with dead batteries taking up space in my basement. I was thinking of putting in a backup...

Hello there, I'm confused on several things such as the potential difference it provides and how it pushes the charges through the wire or conductor or circuit. So when a battery comes into contact with a wire, the positive charges flows from high potential through the circuit to the low...

My friend and I were planning on possibly developing our own tobacco vaporizer, but we lack the electrical engineering knowledge. We know they are simple devices with few parts, (a battery usually being the largest one) and we just were not sure how exactly the electrical energy was transferred...

I am looking to build a skateborad like device that i want to power with electric skateboard-like system. However I only want it to go 1.1m/s using 60mm wheels moving a 100kg load for 12 km. I am looking for help determining gear sizes, motor sizes and specs, really anything. I have seen so...

Hi all, I work on something.. its alarm tag. I found buzzer which i want to use in simple electric circuit. Components are the buzzer, and a battery. The tag must work minimum 5 min. The problem is.. I can not find battery small and powerful enough at the same time. Battery diagonal must be 3...

Hi, as I know the burst C rating usually refers to the max current allowed for 10 seconds. if I need higher current for 1 second, I can do it? The heat is the problem here?

Hello, lovely people. I was wondering if anyone knows what kind of battery Marty Cooper used for the very first cell (mobile) phone call in 1973? I know that by the 80s they were using Nickel-Cadmium batteries but I don't know about that first one. Thanks in advance, Kathy

Homework Statement I am going over problems for exam study - here is the question with my submitted solution. Anything helps, just trying to correct mistakes so I can study the problems. Two capacitors C=3mF, C=2mF are initially discharged. They are connected in series and then the two ends...

I have to charge a 12V 7AH battery using a wind turbine. For this purpose what kind of battery should I employ?

I am researching whether or not there is an equation that calculates energy used by a DC battery to keep a capacitor charged over time in a capacitor circuit. I know a capacitor in a circuit acts as a break when it is fully charged, but does the battery continue using energy to keep the...

I have a 4.5v LED strip 14.5watts (unknown amp draw; maybe 3amp) 30 LED 5050 per meter that runs off 3 AA Alkaline batteries. It runs fine for several hours (with the AAs) which is great but Id like to hook it up to a small power bank. I pulled out an old old power bank of 2200mAh 5v 1A output...

I am working on a project which involves rechargeable batteries. To calculate the variations in the internal resistance of the battery, i used data from the existing experimental results to establish an approximate value for the internal resistance as a function of the SOC, discharge time and...

I have a question that I believe requires knowledge on the graduate level, but I can't necessarily express it in terms more complicated than plain English. If this is not so, moderator, please adjust to your taste, and thank you! If it helps to know this, I'm an audio/video systems designer and...

i just had curiosity when i saw car magazine about http://www.roadandtrack.com/new-cars/videos/a18350/lithium-batteries-not-just-for-hybrids/ What is the first car model using li-ion battery in their starter motor..? Is it Porche's track-oriented models?

I'm a complete noob when it comes to electrical stuff, but I have a question about something, so please bear with me. I have a Dell laptop (Vostro 3550), and recently bought an external battery for it ("Dell Power Companion"). The external battery is rated at 12,000 mAh. Since my laptop voltage...

Homework Statement When an external resistor of resistance R 1 = 14 Ω is connected to the terminals of a battery, a current of 6.0 A flows through the resistor. When an external resistor of resistance R2 = 64.4 Ω is connected instead, the current is 2.0 A. Calculate the emf and the internal...

I have a project that involves a small motor, and the battery powering it would blow the motor in an instant without proper use of resistors. The battery I'm using is rated at 9.6 volts and 1600ma. The motor however, is rated at 3 volts and 0.3 Amps. I would like to go just under these ratings...

Homework Statement Homework Equations / 3. The Attempt at a Solution [/B] Here is what I attempted for the HW. I only got 2/10 for this here so I'm wanting to correct my mistakes.

Like the title says, I'm Building a 13S2P battery pack. I'm trying to figure out how to wire it most safely and efficiently. It's been a long time since I've build a custom pack of this size & as I'm using $220 worth of 60A 3.7V 26650's, I'd like it to not explode, short, or go bad anytime...

This caught my eye recently. Sorry If it's already been discussed but I couldn't find a previous thread. https://news.utexas.edu/2017/02/28/goodenough-introduces-new-battery-technology Lithium-Ion Battery Inventor Introduces New Technology for Fast-Charging, Noncombustible Batteries but then...

Homework Statement I am confused what to do but I have to find the current through the battery: Homework Equations V=IR The Attempt at a Solution I decided to find the equivalent resistance and do V/R = I using the 14V, but I believe my Req is wrong. What is throwing me off is the...