Batteries Definition and 464 Threads

Inside the battery (we stress INSIDE the battery) in a closed circuit (consider the battery attached to a lightbulb with the light bulb glowing), the battery (a) creates positive charge. (b) pumps positive charge from its positive terminal to its negative terminal. (c) creates...

I have a device that is currently running on 6 1.5V D batteries which I have to replace every 2 months as they drain very quickly. In theory would it be possible to take (say) a phone charger that puts out 9v and connect and make a circuit drawing from current from a wall socket? Obviously...

I heard that batteries can affect soil. I wanted to examine this and started to investigate into this problem. I did experiment: I planted bean into 2 pots- 1st pot: soil without batteries, and 2nd pot: soil was mixed with batteries. After 4 days, plant from 1st pot grew normally and plant...

Homework Statement An Ordinary flashlight uses two D-cell 1.5V batteries connected in series. The bulb draws 450mA when turned on. A)Calculate the resistance of the bulb and the power dissipated. B) By what factor would the power increase if 4 D-cell batteries in series were used with the same...

I have a couple of different lithium ion battery packs. On one pack charging current reads 0.1 amps, and on the other 1.5 amps. I already charged the 0.1 amp pack with 0.1 amps, and seems to be working. Now, I'm sort of weary charging the other pack with 1.5 amps. Doesn't that seem too much...

I'll start with the typical "I'm new to this and don't know much about DC wiring and power." I'm trying to wire 10 flickering candles that each run on a single 9v battery into a fake cake and do so in a manner that will make pulling the batteries out quick and easy without having to remove each...

Say I have three different circuits, each with three 9V batteries: CIRCUIT ONE Parallel 9v Battery 1 -> Coil 1 -> 9v Battery 1 9v Battery 2 -> Coil 1 -> 9v Battery 2 9v Battery 3 -> Coil 1 -> 9v Battery 3 CIRCUIT TWO Parallel 9v Battery 1 -> Coil 2 -> 9v Battery 2 9v Battery 2 -> Coil 2 ->...

This is something you might want to take a look before you go off on your next air travel in the US. http://www.powerpage.org/2007/12/us_dot_bans_transport_of_spare_lithium_batteries_in_checked_baggage.html This is going to be a bit annoying since we travel with spare camera and camcorder...

Homework Statement The lifetime of batteries are independent random variables Xi, i= 1,2,... each having exponential distribution given by the density f(x) = 2e^-2x, x>0, 0 elsewhere. If a flashlight needs two batteries to work, then the time that the flashlight can operate is a random...

Hi, can I connect two 12v batteries in series to get 24v and also each battery has individual connectors connected to 12v alternator from engine for charging? Would this cause problem? Or what type of converter (if there is one) that can do 12v to 24v with max. 50amp. Another option I...

Solar Panel to Recharge Hybrid batteries? I'm considering buying a hybrid vehicle (Ford Escape) and wanted to get the forum thoughts on an idea I have had bouncing around in the old nogen for a awhile now. What type of effeciency gain could I pick up over a typical Houston year (very hot...

Homework Statement The circuit in the figure is composed of two batteries (E1 = 6 V and E2 = 4 V) and three resistors (R1 = 4 , R2 = 4 , R3 = 5 ) as shown. (a) What is the current I3 flowing through the batteries? I3 = .286A (no problem here) (b) What is the voltage Vb - Va...

i found this online, he puts two batteries in a glass of water for 30 minutes, then removes the batteries, and the water lights with a flame. Its been favorited by 6000 people so it seems to be popular. How does that work? i presume that its a type of electrolysis? EDIT: DOES NOT WORK!

Homework Statement What i may ask may seem simple, but it is casuing me a lot of headaches. What is the effective potential difference across a resistor if it is connected to a parrallel connection of batteries. Let's quantify the variables. Battery one has an e.m.f. of 2 V while battery 2 has...

A toy car has a mass of 120g, including two 1.5V batteries connected in series. Suppose the motor that drives the car is 80% efficient (i.e., 80% of the electric energy goes to the drive wheels, 20% is dissipated as heat) and that friction and air resistance are negligible. How much charge...

I know radioactive isotopes are used in RTG's in satelites and space probes. But are there any specific reason why they are not used in laptops, cellphones and other electronic equipment? From a environmental and health point of view It can't be any worse than using heavy metalls like...

i have two UPS's that protect my computers and entertainment system. I'm at less than half the kva rating of each of the UPS's but the runtime is too low for my liking. they both run with 4 qty 6V sealed lead acid batteries. my question is: can i simply use higher AH capacity batteries...

I'm currently studying for the MCAT and most of the physics questions I get wrong, the explanations adequately help me. But, one question has me stumped. "Question:" What is the standard emf for the galvanic cell in which the following overall reaction occurs? 2Na(s) + Cl2(g) ->...

hi can anyone tell me the concept of liquid batteries.

Hi alls Just last week, my laptop Dell C400's battery was down. The battery led blinks all the time. I do not want to buy a new one right now, may be after several months, I will buy a new laptop because this one is rather old (3 years or so). Of course I can use the pc with its adapter on...

Hey, Ivan... since you were the one all goo-goo over the new Airbus, check this out. :biggrin: http://www.funmansion.com/html/Airbus-Remote-Control-Plane.html" Oh crap... how do I edit the title? I just caught a typo.

Is the purpose of batteries and power supplies in an electrical circuit only to pump the charge that already exists in the metal conductor wire or do batteries and dynamos etc. actually create charge then pump it into the conductor wire?

Most batteries have a low voltage output like a lead acid +- 2.2V per cell And carbon + zinc have something like 1.5V and so it goes on. Can a battery have a high output voltage without putting it in series Example: I want a battery with 100V DC output per cell, does that exist or not...

Homework Statement Find the current flowing through the 200ohm resistor E1=5v E2=10v E3=15v r1=3ohms r2=6ohms r3=9ohmsThe Attempt at a Solution I know that I1+I2+I3=I I can't seem to get a loop rule that will allow me to solve for I though. I came up with the equivalent resistance in the...

I wonder why they have so many different sizes for a 1.5V battery? Is it because some sizes are better in terms of performance?

anyone help me out with this probelem?

Do 3023 batteries exist!? (not CR ones) Hello everyone I am new on these forums and wanted to ask if anyone knew anything about 3023 batteries. I have a Dreamcast console that is very old and the circular battery inside the console that is responsible for keeping the internal clock...

1) will a 12v 3.5amp/hour battery support a 120v - 4.7 amp motor? if not kind of battery specifications will. 2) Is an electric motor a DC or AC. help is much needed,thank you.

Let's say you put ina battery that's 9 volts. YOu can vary the voltage on the device. Is it changing the battery voltage or the voltage used throughout the system? How can you have a set voltage> THe equation for current goes V/R=I. SO if you have a certian resistanve and current the...

I want to learn the GFD lead acid batteries used in NPP. Have Exide and Deka ever supplied for NPP, or who are the main suppliers in this field? We know VRLA betteried dominate the market now, but have this type ever been use in NPP? As for UPS, do bettery suppliers provide UPS together...

Hi, I just would like to make sure that my concepts are clear on voltage. Using a battery as an example, I have a couple of questions...The battery separates the positive charges from the negative charges, which in result causes a separation (voltage). Now, if the battery is connected to a load...

The things that power all your mobile devices and remeber all your data when the mains go down, the most polluting thing ever invented, not only enviromentaly but soccialably, they intrude into ones every move, taxes should be diverted from autos to batteries, apart from those powering medical...

There was a thread here recently about the http://www.theinquirer.net/default.aspx?article=32550 video, I can't find it anymore. More news: http://www.nytimes.com/2006/08/14/technology/14cnd-battery.html?hp&ex=1155614400&en=499692c95b993103&ei=5094&partner=homepage

I've got a Mastercraft 15.6A drill. The batteries have died. They don't seem to make this one anymore; the nearest is 14.4A or 18A. Presuming the socket hasn't changed, anyone know what would happen if I used 14.4A or 18A batteries? I suppose I also have to worry about what might happen if I...

I just opened a couple of watch batteries that were in blister packs. They are large batteries - the size of nickels. The blister 'popped' when I opened it, certainly it was air-tight. There was a noticeable chemical odour that emanated from it when it was opened. Did this with both...

I'm going to be running an appliance off car batteries. Appliance specs: 120V 60HZ 12A 1500W I need to run it for about 6 hours. Would a single car battery with an engine running maintain that power? Or will i need to connect several up in series??

Problem: "Two automobile batteries are connected in parallel to power a wheelchair. If each of the batteries has an emf = 12.0 V and internal resistance r = .020 ohms, and the wheelchair motor has a resistance R = 1.00 Ohms, find the current provided to the motor. What would be the current...

How long does your graphing calculator's batteries last? I think somebody might have switched mine. The calculator won't turn on. Does that mean my backup battery is out? I sure hope I didn't lose all the programs I programmed. That would suck. Well, more than suck. :cry: HOW CAN THERE BE A GOD?!

1. can someone please explain the idea of a dielectric to me (or at least give me a link that explains it in laymans terms) - all i understand is that its placed between two capacitors and it increases their capacitance (by the factor of K). what does it do to the voltage? and the charge...

Hi, I didn't know they still made these anymore, but I just picked up a few zinc-carbon batteries from the corner store (not knowing they were zinc-carbon - I just bought them because they were three times cheaper than the other ones :rolleyes: ). Correct me if I'm mistaken but the anode...

Do a google on " flow battery " this woman from Austrailia did some recent work with them ,really interesting stuff.. in Japan they use them to supply Grid Power from a windfarm ..

Hi:smile: , How are you? I am a student in Academy for aviation. I study now Electrical book for avionics, I have confuse about Lead-acid battery and Nickel-Cadmium battery. I want to know what diffenet between them. Thanks I appreciate it:rolleyes: .

hello, one of my projects is to develop some sort of self heating bottle. i must fabricate and build a working prototype. i have a couple of ideas. one is to use the same concept as a toaster. wrap the bottle in nichrome, a type of resistance wire. however, would the wire get hot enough to heat...

Stupid question time. What happens if batteries of different voltages are connected in parallel? I know, in circuit theory class, you just don't do that, because it doesn't make sense, but what happens if you actually DO it in real life?

Why the circuit must be closed to let the batteries send out electrons? If the circuit is opened, why do the batteries stop sending out electrons?

Hello, I am just starting to teach myself about electronics, and am already coming up with questions my text is not answering adequately. Unfortunately I don't know anyone who I could ask as I'm not in school. Consider two 12V batteries, say a car battery and a garage door opener battery...

What are the best and most cost effective rechargeable 'AA' and 'D' batteries on the internet in the United States? :confused:

Can mixing (in series) old cells with new cells of the same voltage and rating damage the new cell? If so why? The cells are recharable.

Hope this is the correct forum for this... :rolleyes: I ran across this today. I've begun researching what companies are doing to replace our current dry cell batteries used in electronic devices. This is the first reference I've seen of a so called nano battery. Anyone with experience here...

If they figure out how to manufacture them efficiently, we might see nuclear powered batteries in a few years. It seems from this article that engineers were finally able to convert radioactive decay into a useful form of power...