Battery Definition and 1000 Threads

I read an article in prison inventions and was impressed by some of the things the inmates MacGyvered. A very simple invention I saw though was a cigarette lighter made from a battery: I have an understanding of basic electronics theory but I have very little practical experience. I can see a...

How big of a battery would... How big of a battery would it take to power the average sized home for 24 hours? Considering basic kilowatt-hour consumption with AC. Would it even be possible to power a home off a DC source? I would hypothesize that you would have to change all of your...

Hi, I was just learning about Electric Vehicles, and how they are powered. Let us consider a BEV (Battery Electric Vehicle), and not a hybrid. So we just have the battery powering the drive train and the wheels. The other day a friend of mine asked why the each wheel of the car can't in...

Hello, If a battery has a rating of 24 kWh,what is the maximum power that it could supply at any given second in watts? Thanks

I have a LifeFitness exercise bike. It uses a Hawker Energy Sealed Lead Rechargeable Battery that is three cells with a rating of 6 volts at 2.5 AmpHours for 1019 Watts. The battery is recharged by usage of the bike. However, the bike is designed for commercial use and the battery discharges...

Homework Statement Find the current in the circuit and the voltage on the volt meter Homework Equations E=22.5 V Rtot= 1kΩ + 2.4kΩ + 5.6kΩ = 9kΩ I=U/R=22.5V/9kΩ=2.5mA A voltmeter has super high resistance, to prevent any current from passing through it. I know that. So I have...

Hi, I don't know so much about electronics but... I know when you have a junction of two metals that is heated you can get a small voltage. Like wrapping a piece of wire around a nail and holding a flame over it produces a very small but measurable voltage. This is a thermocouple as far as...

Anyone knows what is the approx. internal resistance of a lead battery, say, 12V, 20Ah. Thanks

HeyoO everyone (^_^) and Thanks for your time. Homework Statement This question is about the "intial" point of time i.e. as soon as the key is closed. Before the current starts to flow which charges the capacitor till the voltage of capacitor is equal to voltage across the battery. A...

I want to build a salt battery, and I've seen them use Zinc and Copper. But what if I replaced Zinc with Tungsten, since it has an ion charge of 6+. Would that increase the amount of ions, released into the water, and increase the power output? Do you have any suggestions for more potent...

I am wondering how can an alternator charge the battery if the rpm change constantly? Can someone please explain me how it manages to produce a constant voltage?

Hi! My brother has a small micro-heater that runs on a single AA battery. The battery life tends to be rather short so we started using rechargeable batteries. The rechargeable batteries are marked as 2000mAh and since they're AA and Nickel-metal Hydride I'm guessing they operate at 1.25v...

I'm thinking about all types of charging (LiIon, lead acid, etc.). I get the basics...but would really enjoy more info on the subject. Also...one thing that confuses me is how you can "overcharge" a battery...and how you can supply too much current (amps) to the battery. Since its generally...

Say you have a battery 100ah and you want to charge it the fastest way. What's better? if you have a solar panel 12v 100w or a solar panel 24v 100w (all at the same amperage rating). I thought the 12v 100w, but a friend is telling something about the "ohm law", which I don't know. Could...

what happens if you connect a 36v electric motor to a 24v battery? Is that going to ruin the battery/motor?

So a battery to one of my phones got left in the car (just the battery) for an extended period of time during a Texas summer. The sides of the battery expanded by a couple millimeters. But I can compress the sides with my fingers as if there was a pocket of air in between the outer tape (with...

Just a bit confused & I am in need of a simple explanation of how energy flows in a battery. This was my thinking: Cathode: positive terminal, current flows OUT Anode: negative terminal, current flows IN Is this correct? And if so, why do many battery diagrams depict energy flowing out...

Why during charging a battery the terminal Potential Difference becomes greater than the EMF?

Hi all, I've been trying to find some sort of multimeter/voltmeter/etc that will allow me to get an accurate (and independent of the handset) read on state of charge, or remaining life, on a standard cell phone li-ion battery. I've found a few voltmeters and the like, but my understanding...

What I'm asking is not strike and dissipate, I'm asking really capturing and storing the energy for later use. I mean are we talking more than cubic kilometers? I know a thunderbolt is just regular, really high power DC but if 220V@10,000W can be bottled in a less-than-half-a m³ UPS, why is...

Hi I'm working on a way of connecting prismatic LiFePo4 pouch cells into a battery pack. I'll probably use G10/FR4 for the isolators, as suggested by MQuack in the Mechanical section of this forum, see this animation (the green parts are the FR4...

Hi to all, I have generator 3500watts (Made in China). it has pull start with rope. and i want alternate start with self start...! i hope you understand what i am talking about. Thanks in advance. what accessories or tools required? how to do? how it works? guys i am not engineer...

Hi All Currently studying for a Subject Enhancement Course prior to starting a PGCE and I am struggling with the Electricity side of things! Something I also struggled with at A-Levels myself many years ago... My query is how does batteries work. I understand the model whereby electrons...

Dear Experts As a rechargeable battery , say a li-po battery, is being charged to near charging voltage, there is less potential difference which in this sense means it takes longer and longer to reach remaining few 0.x volts. Could you be so kind as to explain a bit how a typical charger...

I keep hearing about new and more efficient batteries. Is there a hard limit on the amount of energy that could be extracted from a stored chemical energy source? Obviously the absolute maximum amount of energy would be given by E = mc^2, but I think that would be far beyond any...

Hi I was just on vacation and forgot my camera's battery charger. I thought a lot about building some sort of homemade charger, but just didn't dare try. Luckily it ran out on the very last day, but I'd like to know if it would've worked. Basically, the camera has a 7.4V Li-ion battery, which...

Hi all. I planning to build an electric car at home. I have no expierence with electric vehicles but I studied physics at high school and know a fair amount about cars. After seeing homebuilt electric cars on you tube and elswhere I've been inspired to try bulid one also. I am going to try...

1. A 9 volt battery is hooked up to two resistors in series. One has a resistance of 5 ohms, and the other has a resistance of 10 ohms. Several locations along the circuit are marked with letters, as shown above. If the voltage is zero at the negative terminal of the battery, the voltage at...

A battery is responsible for supplying a constant current to a circuit?

Dear Experts Lets say I have a power source of 9 volts. A 5v output voltage regulator is connected to this power supply. So, input 9 volts, output is regulated to 5volts constant. the output pin is connected to a battery with has a constant internal resistance. Does this mean, because...

I was looking at the simple example of making a voltaic pile using pennies, nickles, and salt soaked paper towels to light up a small LED lamp, but I hate the idea of immediately oxidizing all the metals just get a 1.2 volts for a only a couple hours so I've been researching ways to make it...

This may be in the 'you were afraid to ask' category. There are many devices which work on batteries or alternatively when plugged into the mains. You can recharge the batteries. Obviously when you are using batteries alone they have to have been charged. Now I am finding that while some...

I'm looking at custom building a Li+ battery pack, six or seven cells, and want to design a battery monitoring circuit that measures voltage of each cell and keeps track of charge/discharge. The battery pack needs to fit in a form size of about 8" by 2" by 2" so my circuit should be fairly...

So far I've been studying chemical engineering and it is mostly applicable. I'm not sure which classes I should be taking, though, and whether ChemE is even the best program to study within. Ideas?

Hi, This may sound a little silly but I have a circuit with 1 resistor which is a 1k ohm resistor and is connected to a 9 Volt battery.I found the amps using ohm's law I = E/R which equals 9 amps.I have also used a multi-meter to see the resistance and I'm a bit confused a resistor is...

Hi, I have simple question: In small OFF GRID wind turbine systems, it is worth to continuously charge & discharge 12V Lead Acid Batteries? this means that we want that our loads (lights, Fans e.t.c) are 24hours taking power from wind turbine & batteries will continuously charge &...

I've been reading a lot about solar power recently and far greater uses that could be unlocked if we only had a viable way of storing the energy. I've encountered the fact that no battery as yet comes close to rivaling liquid fuels for as energy as well as research pursuing artificial...

I have a physics book that describes a battery in a circuit as like a pump that provided energy to the charge (e.g. a 1.5 volt battery gives 1.5 joules of energy to each coulomb of charge). Am I right in assuming that the energy in a circuit is directly derived from the chemical/electrical...

We want to implement a fuel gauge into one of our field testing equipment. The batteries are Alkaline type. Is there any proven method to calculate the amount of usable charge left? Thanks in Advance Prathap Chandra

I really want to do research in battery after I finish my undergraduate engineering course. which engineering course should I choose so that I am well prepared to do research in battery? (mechanical engineering, electrical engineering, chemical engineering) Thank you.

Has anyone heard of a feature whereby display processing power is linked to system power levels ?eg.: if you're operating on battery rather than wall plug, can that have an effect on whether you get full acceleration when watching videos? My sister claims that, on her Mac, when the battery is...

Homework Statement The circuit shown in the figure below is connected for 2.10 min. (Assume R1 = 6.00 Ω, R2 = 1.60 Ω, and V = 16.0 V.) (a) Determine the current in each branch of the circuit. *already did* (b) Find the energy delivered by each battery. (c) Find the energy delivered...

Hi all, I am a new guy to the forum, glad to meet you all. iv been doing a little rc project and now need to wire up some lights. iv never done circuit work before but I am willing to gain knowledge on how to. the main problem is that no matter how much i read or calculate, i cannot work out...

My car has a problem that there is some sort of load on the battery even when the engine is off. So the battery slowly drains with time. If left for more than a couple of weeks, the battery will be too drained to start the car. I had this happen to me, and so I bought a mobile booster pack...

I have an Led with the following specifications: 3-3.2 V Size (mm) : 5mm Lens Color : Water Clear Reverse Current (uA) : <=30 Life Rating : 100,000 Hours Viewing Angle : 140 Degrees Absolute Maximum Ratings (Ta=25°C) Max Power Dissipation : 80mw Max Continuous Forward Current : 24mA Max Peak...

I don't know what happened.I changed a ravpower laptop battery for my DELL laptop for almost one year and now if the battery shows full electronic capacity,but it will power off after 5-30 minutes without any warning and cann't start any more.Then I pluged on the adapter,the laptop shows the...

I want to charge up a 12 volt car battery with an AC voltage passing thru a full wave bridge diode and I want my LED to be on when current is being supplied to the battery terminal and if circuit stops producing current for any reason LED will be off and not on as if it where receiving current...

Hi everyone! I basically understand how the materials used in the chemical reaction of a battery work but now I want to know why some batteries have different ratings of voltage. From what I've read, this depends on the materials that are used. What does it mean for some materials to do...

Can i charge 12V 15Ah sealed lead acid battery by giving 60V 4A to it's terminals ?

Hi everyone, I've been reading about electricity lately and I've run into a question that has been bugging me for a while. If you have (or made) a battery that has a rating of 2 volts (this can really be anything, I'm just giving an example) and you wanted to increase it to 3 volts, how would...