Batteries Definition and 464 Threads

Homework Statement In the circuit below the batteries have negligible internal resistance and the voltmeter V has a very high resistance. What would be the reading of the voltmeter? Answer: 9.6 V. 2. The attempt at a solution I used the Kirchhoff's rule: the current that flows from 10 V is...

Homework Statement For the values shown in the figure below, calculate (a) the current through the ammeter A1, (b) the current through the ammeter A2, (c) the PD across R2. Assume that the internal resistance of each cell and the resistance of each ammeter is negligible. Answers: (a) 0.05...

will this work say you have 4each 6 volt batteries and 2 each12 volt if you wire your 4 each 6 volts in a series- parallel so the 4each 6 volts are are now in princeable 2 12 volts wired parallel could we now add 2 12 volt batteries into the parallel giveing you a 4 12 volt battery bank

So say we had 2 batteries, B1 and B2, and B2 is on top of B1. The + terminal of B1 connects to - terminal of B2, and the + terminal of B2 connects to - terminal of B1. Why does this double the voltage compared to the voltage of just B1?

Homework Statement https://i.gyazo.com/ec36f9345b56810598a5b2cebc62aeb7.png Determine the current in the 7ohm, 8ohm, and 4ohm resister. Homework Equations The series/parallel equations for equivalent resisters. and V=RI. The Attempt at a Solution I'm normally pretty good with these circuit...

Hi pf, Consider a D.C. circuit with a 5V battery and a 5 ohm resistor which will draw a current of 1A. If we ignore internal resistance then adding another battery in parallel will not change the current through the resistance (V=IR). What will happen is that each battery gets 0.5A each now and...

Hi guys! I am currently having Physics Internal Assessment in my school and I want to do an experiment to calculate the different times it takes for a 9V cell to to discharge (reach a 0.1V) in different temperatures. The problem I am having right now is to efficiently discharge my cell. How can...

Homework Statement Homework EquationsThe Attempt at a Solution If I take KCL at node V1 (I'm assuming current traveling from nodeV2 to node V1) Current in = Current out V2 - 2volts / 2 ohms = V1 / 8 ohms so my question is, how does the battery (2 volts in this case) play a role in nodal...

A Google search only yielded whether they have CMOS batteries, but I'm referring to batteries that if you were to unplug your computer it would go off. I opened up a mini Desktop and just saw a motherboard without any large battery anywhere, so I'm guessing no? I would like to be sure however...

Hi everyone, I am a senior Chemical Engineering student working on a project for a course of mine designing a remote control car. We have made 10 batteries from hand that each produce roughly 1.5 volts each. The car is fairly heavy and we only have a small electric motor to work with, and thus...

Hello i am abeginer i have to connect a 12v dc motor can i connect it to two 9v batteries in series meabs a total output of 18V.

I have done a decent amount do research on this topic and can't find out about the "magic" that happens in the battery. I know that is is made of cathode which is the positive and anode for the negative with electrolytes in the middle. What I can't find is what anodes and cathodes are made...

A battery has an Emf 6 Volts. It is completely discharged. It is charged by maintaining a potential difference of 9 Volts across it. If the internal resistance of the discharged battery is 10 ohms, find the current through the battery, just after the connections are made. My textbook says that...

I am using a buck converter with a battery pack, for a usb charger. The issue is, is that the buck converter I have ( http://www.ebay.com/itm/DC-Converter-Step-Down-Buck-Module-7V-24V-to-5V-3A-5V-usb-output-power-adapt-/261030150117?hash=item3cc69bffe5:g:Q3UAAMXQTT9R0Qos ) has a led on it, which...

Homework Statement for S1,S2,S3,S4 are all closed at the long time find the current in each resistor Homework EquationsThe Attempt at a Solution why I3 is not = i2? the solution of this question is 24-28I1-I212-12=0 7I1-32=3-----(1) 12-12I2-163=0 3I2+43=3 ---(2) I1+I2-I3=0---(3) I1=0.492...

Homework Statement Find I1, I2, I3 as well as the voltages across each resistor. R1= 50 ohms R2= 220 ohms R3= 150 ohms Homework Equations Kirchhoff's loop law Kirchhoff's junction lawThe Attempt at a Solution Loop 1: Starting from the negative terminal of the 10V battery (ccw) 10V - 50...

question: referencing ohm's law, why is the voltage in an ideal battery equal to that in an open circuit? I know ohm's law, and I know that an ideal battery has the same voltage no matter what it's connected to, but what does that have to do with an open circuit?

Homework Statement Picture a circuit grounded at the left lower corner. Then as you go up the left side of the circuit, you have a 9V battery. The top left corner is labeled a. Then on the top of the circuit, you have a 2 ohms resistor. Then on the right side of the circuit, you have a 6V...

Hi all, For some reason I'm really struggling to understand how batteries store energy and how this relates to electric potential. Can I just think of a battery as two separate plates one accumulating positive charges the other negative. The positive and negative charges are attracted but they...

I have a mws freedom pmg 12 volt 1600 watt PMG with falcon mach 3 blades. Live in city so turbine is only 12ft off ground. Don't get good wind. Can I use a 24 volt pmg to charge my 12 volt battery bank? Have charge controller that can handle high voltage and will dump at 14.5 volts. Also have...

Hey Physics Forum! So I will try to give as much detail as possible and needed without dragging on. We have an RF source at 5.8 GHz producing -17dBm and we eventually amplify it close to 27dBm (so we get as close to 30dBm out of source antenna as possible). We are using 5.8 GHz slot antennas...

Homework Statement Full problem statement and diagram is attached. Homework Equations Kirchhoff's rules, ohm's law The Attempt at a Solution So I presume that what I'll be looking at here is the use of Kirchhoff's Rules and Ohm's Law. I do not know how to approach this as I have never come...

So I want to charge a battery from a pedal-powered dynamo, and use that to power my PC, my screen, and pretty much everything else in my home office. This whole thing is a little project to improve my own health while I'm working; I'm not here expecting to make major miracle savings on the...

I'm wanting to know if I can and if so how to measure the voltage of two AA batteries whilst they are in a device with the device turned on. This device is a vibrating toothbrush so if anyone could help with an answer, it would help teremendously with my science project as I am testing the...

Say that 6V battery is connected to a lamp that takes 3V from each coulomb. Does that mean that the battery can supply 6V or dependent upon the need of components in the circuit ?

What is the difference between AA and AAA batteries? Will the output voltage of 3 AAA and 4AA be same?

Homework Statement A 5V battery rated at 1800mAh has a soucre resistance of 10 Ohms. What is the maximum power that can be extracted from the battery? Homework EquationsThe Attempt at a Solution I understand that had the battery not had any source resistance then the power out would have been...

Does anyone know if there are any substances that can be used/made into a substitute for a battery?

What are the methods of dissolving sulfate crystals that form on the lead plates in a lead/acid battery?

Homework Statement Can somebody help me understand why two 2V parallell batteries weill have the total voltage of 2 while two 2V batteries in series will have the total voltage of 4V? Is there a good analogy to help me understand? Homework EquationsThe Attempt at a Solution

Hello everyone, I am currently involved in a project where I'm building a pipboy 3000 from scratch. I'm close to finishing it and I wanted to take the extra step and make some functional/interactive buttons on it. I've been searching for led button switches to use for some of the buttons for...

So 8 AA batteries is 1 Watt, I was just wondering how many batteries it would taje to power my PC for an hour, so if I have a 750W PSU you would do 8x750 to work out the amount of batteries, but is this per minute, second or hour? This is just interest, not actually going to do it!

when they have the same properties , the same current circulates in them because they are in series .. but the question is how to define the output current when there are two batteries , one in good health and the other defective so one deliver a high current and the other a lower one ? thank...

Homework Statement A circuit is constructed with five resistors and one real battery as shown above right. We model. The real battery as an ideal emf V = 12 V in series with an internal resistance r as shown above left. The values for the resistors are: R1 = R3 = 57 Ω, R4 = R5 = 75 Ω and R2 =...

I seem to lack a conceptual understanding of how batteries in series and parallel affect the brightness of a bulb. I understand that current adds when batteries are in parallel and that voltage adds when batteries are in series, but why does 2 batteries in series make a bulb more bright than two...

Homework Statement Batteries are connected together with their + and - poles. Homework Equations The Attempt at a Solution I quess that nothing happens because there is no change in potential difference.

Homework Statement How can I get the maximum Current Intensity by connecting 72 cells to a 3 Ohm resistor each cell has a potential difference of 1.5 Volt and internal resistance of 1 Ohm Please don't tell me to connect them all in parallel or all in series as in parallel the potential...

Hello all, I really hope this isn't a super annoying question for a layman like me to post here, but I just bought an airpump that runs on 12V DC1, but I want to be able to run it from a portable battery pack. So, I found a 2000 mAh 12V DC battery2 and a female 12V DC car adapter3 to connect...

Hello guys, It is said, that the battery differs from a capacitor when it is not connected to a circuit, by not having a separation of charges. Its potential is due to a chemical process. My question is this chemical energy creates an electric field inside the battery? if no who creates it...

I am building a system which uses multiple components, each has varying voltage. The large motors use a voltage of 14-16 Volts, thus there are several batteries wired in series, providing this voltage. Now, there are other components such as microcontrollers, multiple sensors and smaller servos...

Hi, I have just got into the battery industry and i would like to understand a few things especially when it comes to sizing a battery. For example: if i have a load of 1600W and the system voltage is -48V DC (for a telecom application). The main supply is AC which is converted into DC through...

Once during a severe hail storm (it lasted a few minutes and looked like it had snowed everywhere), my friend starting jumping around as if something was burning him, and he pulled 2 AA batteries out of his pocket and threw them outside. They were really hot and quickly melted a hole in the...

Good day, I am adding a solar setup and inverter to an RV and have a question about how to design my battery bank I will be using 6V AGM Solar Batteries. I need to make a 24V battery bank. Problem is I only have space for 6 batteries. And currently I only know how to get 24V out of 6V...

I'm setting up an amplifier which is intended for use in a car, and I'm not using it in one. I'm trying to power it through a typical DC 250 volt wall outlet. What kind of transformer should I use? (I'm also trying to power a car stereo with it as well)

Hello I made a little wind turbine so when it is directed at wind it turns and generates electricity as I can see the outcoming voltage on voltmeter. My question is how can I store its energy? Can I use a rechargable battery and let it run out, then stick copper wires at each sides of it coming...

Hello, I'm looking for rechargeable batteries for 4x 5V motors of nominal current draw 1.2A and peak current up to 3A to power my robot. I'm wondering about...

Recent threads started discussing the Tesla batteries. It forked into consumer and utility applications. https://translate.google.com/translate?sl=ja&tl=en&u=http%3A//www.mitsubishielectric.co.jp/news/2015/pdf/0622-b.pdf is news of a 50 MW. 300 MWh battery to be installed with a solar...

I'm working on a very similar issue to the one shown below https://www.physicsforums.com/threads/linking-battery-packs-to-change-voltages-and-how-to-charge.514002/ I've found some batteries that should do the job. i need to keep them fairly small, and the length of charge doesn't matter too...

Hello, new to the forums. I am in school, as an Ecology major, but recently endured a long-awaited realization: I LOVE to build things! In my free time I find myself (attempting) figuring out how to build TEGs for our school's compost pile and creating all sorts of fancy aquaponics systems. I...

Forbes has an interesting article about Tesla batteries for use by utilities. It jumps around between capital costs and operating costs. But the interesting part is that it cites several ways utilities view the value of storage. It is more than just peak versus off peak...