Batteries Definition and 464 Threads

Homework Statement what is the current in each of the branches in this circuit: [PLAIN]http://img593.imageshack.us/img593/893/resisotrcurrentquestion.th.jpg http://img593.imageshack.us/i/resisotrcurrentquestion.jpg/ Homework Equations v=ir r1+r2 = r3 1/r1 + 1/r2 = 1/r3 v1 + v2 = v3 ? The...

hi everyone, please look at attach picture. in the circuit total current through 20 ohm resistor = sum of all currents delivered by each cell. is this correct? if one of battery is reversed then current of such a battery will be subtracted from the sum. is this correct? i am...

I am trying to do a project in a remote area but I need bright lights. I already have 4 car batteries and 2 tripod halogen worklights from home depot (http://www.homedepot.com/h_d1/N-5yc1v/R-202066789/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053"). Each light is 500 watts so at...

I have always preferred Duracell batteries because I believed that they were less likely to leak. However the Duracell battery in mouse leaked and damaged the mouse, and the Duracell battery in a clock also leaked damaging the clock. The mouse was used every day and changed as soon as it quit...

Hey everyone. I'm a beginner when it comes to making stuff with motors and batteries. Could anyone give me a link or a very good explanation on how to wire a 9 volt DC motor to 2 9V batteries (that are supposed to be wired in parallel) to power a propeller? I have the motors and the batteries...

I have 54 Maxwell 2.7 volt 3000 farad ultracapacitors and would like to know if they can be placed in series with 12 12 volt lead acid deepcycle 200 ah batteries. all in series. would it work? why yes or why not? this is a circuit to operate a electric vehicle.

Homework Statement For the circuit shown in the figure below, calculate the current I4 through the 2.18 resistor. As shown, R1 = 4.20 R2 = 8.12 R3 = 6.10 R4 = 2.18 I1 = 3.16A and E1 = 18V I couldn't get the picture on here but I will describe it: It is a parallel circuit, with...

In this article http://www.adlabs.com/library/battery.html" (read PDF) an author proposes high energy density rechargeable aluminum-based batteries.They are based on reaction of Aluminum with Iron (or other metals) and oxygen.I still trying to understand why autor is so sure that such type of...

Homework Statement Find terminal voltage, currents of each battery [PLAIN]http://img26.imageshack.us/img26/8667/questionl.jpg Homework Equations \epsilon=I(R + ri) Vterminal= \epsilon \pm I*ri The Attempt at a Solution Find current: I=\frac{\epsilon1+\epsilon2+\epsilon3}{R+r1+r2+r3} Fine...

Homework Statement The distance between two parallel plates is increased while they remain hooked to a battery. The energy stored in the capacitor will: AND The distance between two parallel plates is doubled while they remain hooked to a battery. The battery voltage also is doubled. The...

So I'm trying to understand the relationship between current & voltage as well as the basic electricity laws and Diode operation. Attached are 2 circuit diagrams for reference. Assume that Diodes can withstand against whatever voltage/current the circuit generates. Can Anyone explain me what...

If i connect the positive terminal of a 5 volt battery to positive terminal of 10 volt battery and the negative terminals of both batteries are also connected without using any resistance or any other components in between what will happen to the two batteries?. Will the one with higher voltage...

Lets say I'm in a train going the 1/2 the speed of light. I have a light source that releases signal photons. I aim the light source in the direction I'm going and release 1 photon. Now my energy supply for the lamp has decreased by hf. From a person on the platform the frequency is shifted...

Hello all! I do not pretend to have any knowledge of electrical engineering, just enough to get myself in trouble and blow up some transistors. That being said, I have a question for the experts. My recent hobby project requires my computer software (my area of expertise) to interface...

Hello, I do not know if this is the right place BUT, I might as well ask the experts. I am working for the largest mine in Bolivia, and the biggest restriction is the amount of electricity provided to the facility. I had heard a conversation in the past about High-Efficiency Electromechanical...

so i have a device which uses 2 AAA batteries. i don't like charging batteries all the time so instead i want to power the device via usb. a AAA battery: 1.5 volts and 300-1000 mAh (milliampere hours) usb has 5 volts and max current is 500-900 mA how do i do this?

How could you ensure that an electric battery produced an electric current reversibly? How could you achieve maximum work from an electric battery? I really have no idea how to solve this. Thanks for your help! (Also sorry I first posted this in advanced physics...i don't know how to...

Hello everybody, I tried to make a special LED I <3 you gift for my girlfriend and it seems that I failed to take into account the battery discharge curve. I was using 50 red LEDs that I originally measured with my voltmeters LED function at 1.7v. With measuring LED voltage, is it better...

My computer mouse uses 1 AA battery and when the battery is weak, the pointer becomes "sticky". i keep these weaker batteries aside to be used in other gadget like TV or aircond remote controls. These gadgets require 2 AA batteries. If i were to use 1 brand new AA battery and another, a...

im new to finding this site and sorry for the lame question.. I am just a tinkerer and in need of some info..im working on a project that uses 2 d-cell batteries in series as a power source. so i thought id get a power adapter to save on buying batteries sounds easy ? hardley for me, 2x d-cell...

Just a quick poll. :) - Mugs

Okay, this is obscenely easy and that's why I'm confused on it. http://teachwithtech.com/Full-Product-Listing/Vishay-TSAL6400-10-Pack-p21.html What I'm trying to do is power two of those LEDs off of a single triple A battery, if at all possible. I don't know what the specifications mean. I...

In a 9v lithium battery, it has a capacity of 1200mAh. It is said quite frequently that it means 1200 mA in 1 hour or 2400 mA in 30 minutes etc. But how does it know how much to put out? Is it completely dependent upon the object drawing the current? If the answer to that question is yes...

When looking through the ionization energies/mol of various elements, I'm wondering if it wouldn't be possible to create an incredibly high potential battery by stripping off 10, 20, 30, or more electrons from each atom on the positive side of the battery. I suppose I should ask first, is...

Okay, to cut a long story short, I got hold of a: 16~18V, 30W, White LED, 2100 milliamps. And a 32~36V, 100W, White LED, 3500 milliamps. I got some 6V lead batteries, and I would like to use them to make a crazy flashlight. I tried searching, I came upon quite a lot of solutions...

Would titanium and copper make a better Earth battery than iron and copper? What will the voltage and current difference be between the two?

Hi Gents, new guy here. I'm an ME by degree ( 25 years ago.) but it's been a while since I've done any real number crunching. ( Got moved to management.) Especially in EE areas. So here is my question. I have a couple of small 12V lead acid batteries in the 2.5-7Ahr range that I use to power...

Hi, I have some questions please... Can I use a 9 watt solar panel to charge a 12v battery directly? Do I need a rectifier or is the loss back into the solar panel too small to worry about? Also, can I use a 24v electric motor (permanent magnet generator) to charge a 12v battery - or is...

I took a two-hour trip with my electric mini crosser (mobility scooter, electric wheelchair, whatever), and I started thinking about how much energy we can actually pack into batteries. So how "dense" (watts per volume unit or whatever) are the practically applicable, and the most advanced...

http://www.msnbc.msn.com/id/29900981/ "One of the first compilations used molten antimony and magnesium as the charge holders with a layer of sodium sulfide between the two."How does this work? What chemical reaction is taking place between the metals and the salt?

I am trying to develop a battery operated invention that will be used primarily in sub freezing conditions. From what I can tell from my research so far, a simple 9 volt NiMH or lithium will work fine under these conditions. The only problem I foresee though is that when this was eventually a...

I'm 99% sure this is a purely psychological effect, but I find it very interesting. I can't think of any way a battery could actually lose a noticeable amount of mass from being discharged, but to me when I go to replace a pair of spent batteries, they always feel substantially lighter than...

In the figure below, the resistances are R1 = 1.1 , R2 = 1.5 , and the ideal batteries have emfs 1 = 2.0 V, and 2 = 3 = 5.5 V. http://www.webassign.net/hrw/hrw7_27-40.gif I feel like I've tried everything to solve this problem; I just don't get it!

When a coulomb (of electron) flows through a resistor, it loses the energy it gained in the battery. How were these electrons fueled in the battery in the first place? I already know that chemical reactions rearrange electrons in the battery. But this doesn't directly address the energy gain...

Homework Statement Two batteries and three resistors are connected as shown in the figure . http://session.masteringphysics.com/problemAsset/1122583/1/Walker.21.52.jpg A) How much current flows through 6.0 V battery when the switch is closed? B) How much current flows through 9.0 V...

How does one calculate the potential in an electric circuit when there are more than 1 batteries present? For example, in the circuit attached, how would we calculate the potential at A and B? Is it a simple addition? Thanks,

how do battries create potential diffrence between their terminals?

Have an APC Back-UPS XS 1500, Model BX1500LCD (same as BR1500LCD), computer battery backup unit. It came equipped with two 12V, 9AH batteries wired in series. After 2 years and a power outage resulting in the batteries being almost completely discharged (control software not running), they are...

Find the magnitude of the current in each resistor. R1 = 2.40 Ω, R2 = 4.45 Ω, and R3 = 6.10 Ω. I keep on attempting to use Kirchoff's Rules but it isn't working out. It doesn't click in my head if the current is flowing from the left battery, does the current still split? Is R3 double...

Can anyone please size a heater battery for me? On a supply and extract heat recovery air handling unit. (50% efficient for heat recovery) Outside temperature -2 degrees C Room temp/Return air - 21 degrees C Air voume - 1.3 m3/sec Boiler flow and return - 80-60 degrees C. I have been...

Hello, this is my first time posting on this forum and I have seeked help on this forum before on previous assignments for my physics class. There are four problems that I do not understand clearly or do not understand how the image is portrayed in a blueprint format Problem 1 Homework...

Homework Statement Hi there, I got this question from an old test. I would say I have limited knowledge of electronics and would ask for guidance into what approach to take with this question. Homework Equations The Attempt at a Solution No attempt yet. I thought of breaking it...

Homework Statement http://session.masteringphysics.com/problemAsset/1122583/1/Walker.21.52.jpg This is the drawing for the problem The two questions are: 1) How much current flows through 6.0 V battery when the switch is closed? 2)How much current flows through 6.0 V battery when the...

From what i understand, the only thing that makes using fuel cells in cars versus lithium batties less desirable, is the cost of hydrogen. If hydrogen can be produced extremely cheaply, assuming the same standards for compressing and transporting and storage of hydrogen, would it be better...

i was wondering what are the chemical reactions involved in producing the electricity, that the batteries provide i.e. the reductant and the oxidant

So I just realized that one o fmy batteries that I use for my wireless keyboard is discharging far faster then the other ones. I use a set of 4 for my wireless keyboard and use this sweet 15 minute battery charger I got from radio shack a long time ago. This one battery though, it just...

I was wondering what the effects are if any if I connect a 17V DC source in parallel with a 9 V battery but the 9 V battery has a diode that prevents current from flowing into it. Thanks

Homework Statement What is something other than a battery that I can use for an electromagnet that won't lose power and you can pick how many volts you want. Homework Equationsnone The Attempt at a Solutionnone

I was wondering if I could connect 6v DC [B1] and 12 v DC [B2] batteries in parallel using two Diodes [D1 & D2], connected to +ve end of both batteries in forward biased configuration and then connecting them to the load, by forming a T junction, to get more current through the load [L1] and...

Hello, I would like to be able to heat a nichrome wire with batteries (probably with a D batterie, but if it can be done with AA batteries, it's better, cause it's cheaper). I would like to be able to heat a nichrome wire of about 2 feat long at a temperature similar to the body...