Battery Definition and 1000 Threads

I saved 75 used hearing aid batteries and threw them into a fire. It took about 8 seconds then, boom, boom, boom, boom, boom, boom, boom, boom, boom, boom, boom, boom, boom, boom, boom,boom, boom, boom, boom, boom, boom, boom, boom, boom, boom,boom, boom, boom, boom, boom, boom, boom, boom...

Hi, I have a 2004 Toyota Matrix with 270 000km. It's working great but today when i started my car the battery was going up to 17.2V (i have a battery voltage reader in the car at all time). It's the first time it went up there, it usually stays in the 13-14V. I know something is wrong and I...

Hi guys , i am working in the automotive industry today i encountered a weird electrical issue and i am sure you guys have an explanation , i was using my multimeter to check continuity between different stuff , by mistake i put the leads on the car battery terminals i found the multimeter...

I was recently solving a problem that involved a circuit with a capacitor that was connected to a battery at one end(the second plate just had a wire which didnt lead anywhere). In the solutions it said that this capacitor cannot have any charge since there is no path for the current to flow...

I have a plate capacitor connected to a battery with a known potential difference. Now the plates are moved apart by dx and I must figure out the change in energy stored in the battery. Question 1: When a plate capacitor is connected to a battery charges must flow until the potential difference...

Homework Statement A capacitor stores 7.9 x 10-2 C of charge when connected to a 6.0-V battery. How much charge does the capacitor store when connected to a 9.0-V battery? Homework Equations PE=CQ/2 The Attempt at a Solution QV^2=CQ^2 (7.9 x 10-2)(6)/2 = Q(9) C= .05 C

Hi All I know this is fairly elementary but my brain doesn't want to play ball at the moment. I have a battery pack rated Voltage: 12 V dc Nominal Current: 500 A Peak Current: 900 A Capacity: 12 Ah And a portable coolbox/Fridge rated Input Voltage: 12 V Power Consumption: 47 W If I use...

I am trying to get relay to come on when it gets dark outside this works with one LED and 600 ohm resistor but it does not seem to turn on relay I get 20 ma draw when applying 12 volts to coil it seems you need transistor or SCR to to turn on relay. Relay I think was from a TV it's only 1/2" X...

What are the major obstacles in the development of battery encountered currently? Or there are different difficulties in different aspects? I have tried to search it online but it's like searching for a needle in a haystack.

I have 2 new battery operated clocks that have been lying on the shelf for 50 years never used them both run after I oiled them, they have a motor that winds up a spring and the a little spring that goes around in circle one end fastened to shaft the outside end to a fixed point this rocks back...

I know the mechanism of a circuit containing just a capacitor connected to battery in resistance less wire. The particles are just tending towards making same emf on capacitor. But, I am not able to think clearly for the case of inductor. As, we connect battery and as resistance is 0.So,current...

Hi everyone! I am a new one to the world of the LED lights. However, I have an oncoming project with LED strips. There will be 3 separate runs of a LED strip (4 meters, 4 meters and 6 meters each). In each run LED strip will be put in 1 meter long LED strip profile. I am planning to connect the...

I previously posted the below as a footnote on one my posts on the Mechanical Engineering Forum and it was suggested I start this thread on the subject here. "PS On a general note about battery replacements. On my field GPS I use rechargeable batteries and always test them before recharging...

Problem: At the instant ##t=0## the capacitor C1 has a charge ##Q_0>0## and the capacitor C2 has no charge. (I forgot to draw the switch to close and open the circuit), so the switch is closed and the current start flowing. Let the circuit goes to ##t\to\infty##. a) What's the energy stored in...

Outside the battery, in the conductor it is in the direction of conventional current. But what about inside? Since magnetism and electricity are related, and magnetic field inside a magnet is from South to North (outside it is North to South), i doubted for any correspondence.

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...

Homework Statement We have to measure emf of a battery. We have to voltmeters. Each of them when connected alone across the battery, they read V1 = 0.9V and V2 = 0.6V and when both of them are connected to the battery simultaneously, they both read V3 = 0.45V . What is the emf of...

Homework Statement The circuit above has five resistors. Calculate the current through each. Homework Equations I1 = I2 + I3 (Node Law) ∑Vi = 0 (Loop Law) The Attempt at a Solution I tried to equate the currents using the node law, with I3 = I1+I2+I4+I5 But I see a flaw here, because the...

Homework Statement An electric car (mass 1560 kg) draws power from a set of 24 batteries. Each battery supplies 12 V, with storage 95 A·h. During a test of the vehicle, it is driven at exactly 45 km/h on a level road while experiencing a friction force of 240 N. (a) What is the horsepower...

HI, I have embarked on a small project basically it is for my daughters dance routine prop. I was wondering if I could power a small plasma ball with a battery. The plasma ball power supply specs are: Output: DC 12V 350mA MAX 4.2W It has to be mobile it will sit on a small table which has to be...

Hello, I read article how to check battery condition appropriately (e.g. car battery). (Link: https://www.allaboutcircuits.com/textbook/direct-current/chpt-11/battery-ratings/ ) It's written that: in order to get better results, one must check under load. I'm not EE - I study physics and...

Can anyone tell me how to determine the minimum resistance a battery needs to stop it from shorting? for example I'm making an electro magnet, with a 1.5v dc battery cell, but when i turn it on it just drains the battery.

I'm trying to figure out how to calculate how much energy is stored in a battery between certain voltages. I know capacity is traditionally calculated by multiplying amps drawn by nominal voltage by time, but this seems like an approximation because voltage decreases as the battery is...

I'm currently working on combining energy storage systems like flywheels and batteries to balance consumption/regeneration. I've been looking at using an optimal control scheme so that a cost function can be tailored to our wishes. I'm curious about what other people in this field have been...

[mod note: thread moved from homework forum] I have this Mouser voltage regulator https://www.mouser.com/ProductDetail/STMicroelectronics/L7912CV/?qs=sGAEpiMZZMug9GoBKXZ75xbXFDWiKqpmvrbz5I0HaKg%3D Wired according to datasheet https://www.mouser.com/ds/2/389/l79-974159.pdf see insert photo...

So I was messing around and made a lemon battery using a zinc nail and a copper penny. I wired 4 of these lemons together and connected it to a 5mm red LED and got around 3.7V. It came on but was dim. However, when I wire my power supply and also set it to 3.7V, it is much brighter. Now i assume...

So I've been learning how batteries work. What I learned is that a battery consists of 2 pieces of metal both with different electronegativities. These metals react with an electrolyte. One metal (called the anode) is oxidized and has its electrons removed, leaving behind a positive ion which...

Hi there. I am a novice but I was wondering what you all think is the most applicable mechanical energy storage device for small scale off grid applications is. I just read the thread on pump storage and it seems like a good idea but I thought I would keep it broad. Thanks!

I want to modify my phone by using one of the batteries from phones I have stockpiled over the years and wiring them together. I doubt I have a battery that matches the battery my phone has, so I will have to check. Assuming I have the correct battery, is this a good idea? By the way I have...

Hi PF! Though I've lurked here for some time, this is the first time I've created an account. I'm a volunteer in a country in West Africa. The school I teach at has a tiny library with 4 small dell PC's and a printer that were donated some time ago. A grant was used years ago to buy a battery...

Hello Can you tell me please, to have a battery, do we need a source of a positive electric field and a negative? Or we need constant generation of electrons as well? Can you outline for me the battery principles as I want to get involved in new battery development. Thanks

I was wondering what force hold together like charges in capacitor, battery... we have a capacitor having two oppositely -charged plates so my question is what holds the electrons with electrons in one plate and what holds protons with protons in other plate since like charges repel each other...

Homework Statement An automobile battery has a terminal voltage of 12.8 V with no load. When the starting motor (which draws 90A) is running, the terminal voltage drops to 11.0 V. What is the internal resistance of the battery? Homework Equations V= EMF- Ir The Attempt at a Solution I think...

So, I'm a little confused on how batteries work. I understand they convert chemical energy into electrical energy. I also understand that the battery consists of an anode and a cathode with an electolyte in the middle to force the electrons from the chemical reaction to have to follow the wires...

I'm trying to understand what exactly it means in terms of the voltage of a battery. I know that the voltage in a battery is just the potential difference between the two terminals. But, is the negative terminal used as a relative point and seen as 0? If that's the case does 12V mean that the...

I have or had two good car batteries one was a deep cycle they were connected to a 20 Ma led it could have been as long as four months since solar charger stopped working on top of that they were outside in temperatures as low as minus 25 degrees fahrenheit, what I want to know if one took a new...

Summary I made a vinegar battery that appears to only output .001A of current. I made it very quickly because I had to change my design for a project last minute due to my inability to get a voltage regulator in time. So it is so bad I doubt I could have made a worse battery. Anyway, the...

Homework Statement In one type of battery, the current is carried by hydrogen ions moving through the liquid. If 1A is flowing through the battery, how long will it take for 1 mole of hydrogen ions to move through the battery? 1 mole of protons = 6.0 x 1023 protons qp = 1.6022 x 10-19 C...

I have lots of batteries 12 volt charged by the sun what I need is something that would draw 100 watts and give heat when connected to a car battery? I have ac heating pads, 2000 watt hot water elements lots of copper wire, light bulbs any other ideas?

Homework Statement This circuit is given:[/B] What are the values of ε1 and ε3? Homework Equations IR=V The Attempt at a Solution I get the right answer for ε1 (3V). But I get that ε3=12V and not 15 (the answer in the textbook). First the charge from a to b is 3A. Then I simply use...

Homework Statement This circuit is given:[/B] Each resistor has a resistance of 30Ω, and the electrive force is 28V. Now we shut S1, and the voltmeter displays a value lower by 10% from the previous one. What is the internal resistance of the voltage source? What is the voltage between the...

I am working on a rural project that requires continuous use of 12v battery as a single unit,to keep the project running i need to recharge the battery . How do i connect an alternator to recharge the battery while the batteries is in use. or can i use a Capacitor instead. My thinking is since...

Homework Statement Two parallel plates located at a distance "L" from each other they maintain a potential difference "V" because of a battery (as shown in the picture). Through a small hole, made in bottom plate, electrons get into system (with mass "m" and charge "-e"), with velocity "v" and...

Hi guys. I need a battery car, do you know which is then best brand? I've heard about dyno, does someone who about it? Thanks.

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...

If an AA battery were placed in some kind of ideal conducting 'ether': 1) Would current flow, and if so, what would the flow of electrons look like? 2) How would the magnetic field look? (I imagine that if there was an electric current flowing, that the magnetic field would look a little like...

Years ago I thought I would take apart a car battery melt all the lead I thought there would be at least 10 or more pounds of lead I only got a little over a pound of lead there was a lot of heavy dirt but applying heat to this material yielded no lead it seems the acid eats or corrodes the lead...

Hello. I'm an English language teacher researching the details of a class project; I use projects to develop language skills. I have a background in mechanical engineering but know little to nothing of electrical engineering, hence this post. Questions for members of this forum: Electrical...

I have recently had to adopt hearing aids. I shall soon be taking them back to supplier for adjustment/repair/replacement of one of them. What seems to happen is that with new (lithium) battery it gives sign of life and some amplification into the right ear, but after a few hours there is no...

Hi all, Does anyone know what each pin of this Hitachi 5 Ah 18V Li-ion battery does?: From left to right: C+ + T V LS - LD It powers a cordless grinder that wouldn’t switch on. Only the +, -, and LD pins are present on the tool itself. I’m guessing: C+: Charge enable? T: Temp...