Battery Definition and 1000 Threads

Homework Statement Given the following circuit: What is the actual voltage provided to the circuit by the non-ideal battery if the internal resistance r = 0.50 ohms and the internal emf is 9.0 volts? A. 9.8 V B. 8.5 V C. 9.0 V D. 8.4 V E. 8.8 V Homework...

Homework Statement a generator of e.m.f 20V and internal resistance of 0.5 ohm is used to charge a car battery of emf 12V and internal resistance 0.10 ohm.They are connected in series together with a resistance R whose value is adjusted to give a charging current of 2.0A. I was asked to...

I am designing an electric vehicle and choosing the batteries. For this i want to model some inefficiencys into the batteries. I came across the formulae T=C/I^n where T=battery life C = capacitence I= current n= Peukert's number would 1.1 for n be ok for lithium ion, it seems to take quite...

I have an concept electric car, i calculated it will need 15,000 Wh stored in batterys to operate over its required range (100 miles) on a certain drive cycle. I am attempting to work out how many batteries i need. The motor it is powering has a voltage rating of 156 vDC specs here...

I have an concept electric car, i calculated it will need 15,000 Wh stored in batterys to operate over its required range (100 miles) on a certain drive cycle. I am attempting to work out how many batteries i need The motor it is powering has a voltage rating of 156 vDC specs here...

Hey all .. i happy to join this forum because of the amount of information that it has .. In our city , the electricity cut down for long time may be 10 hours in a day .. I want to make a device so i can convert the car battery voltage ( 12V DC) to (220V AC) this device called Inverter .. i...

I want to make a simple home made battery. I am just starting to do experiments at home and I have read you can make a simple battery from coins like pennies and nickles. In between the coins would be a wet paper towel soaked in salt water which acts as the electrolyte between the two coins...

Hi! I just registered as I have been wondering quite a while about a specific question that grew in my head while reading about electronics in school. As I have learned voltage is a difference in potential. So if we have a 9V battery there is a difference of 9V between the two poles of the...

Homework Statement How much energy must a 42 V battery expend to fully charge a 3.62x10-6 F and a 6.11x10-6 F capacitor when they are placed in parallel? Homework Equations capacitor in parallel therefore total capacitance is the sum... The Attempt at a Solution I thought that you...

I have a motor which i am planning on using in an electric vehicle i am designing. http://www.azuredynamics.com/products/force-drive/documents/AC24_DMOC445ProductSheet.pdf and want calculate the number and specs of batteries needed to run it. I have the power demand from the motor at...

hi i am new to this forum. i want to use a battery that will run a dc motor, dc motor will run three phase ac generator through mechanical coupling and the three phase ac generator will produce out put, now two phases of the ac generator will b utlilized by the load and 1 phase will recharge the...

Hi i embarked on a project to design a battery charging system using an alternator, an electric motor and a battery all connected in a closed loop. The battery powers the electric motor and in turn the electric motor powers the alternator and finally the alternator charges the battery. My...

Homework Statement Three capacitors C1–C3, all initially uncharged, are placed in the circuit shown. The capacitances are C1=8.9 μF, C2=20 μF, C3=12.2 μF, and the battery voltages are V1=18 V, V2=10 V, V3=18 V. What is the magnitude q1 of the charge on capacitor C1 once equilibrium has been...

Hello. As a memorial I am trying to build a light-sensitive unit that will make an LED continuously glow at night. I want to put this in an extremely remote place and be reasonable confident that it will continue to operate indefinitely. The idea is that once it becomes dark, a photodiode will...

Question The α-emitter 210, 84 Po is used in a nuclear battery. The kinetic energy of the emitted alpha particles can be worked out from energy and momentum conservation. It is converted into electrical energy at 5.0% efficiency. (a) Determine the initial power output (in W) of the battery...

I am lost in the middle of a vast desert in my swim shorts. There is nothing anywhere around me as far as you can see. In front of me is a 12volt battery (say lead acid) with no markings or other indicators of polarity. there are 2 wires long enough to make a connection to the emergency...

I've been researching Lithium Iron Disulfide Batteries, but I've been unable to find the half-equations for the Cathode and Anode. Cathode - Iron Disulfide Anode - Lithium Electrolyte - Organic Solvent Blend (Propylene Carbonite, Dioxolane, Dimethoxyethane) The overall equation is...

Homework Statement An AA battery (1.5 V potential) is connected to a parallel-plate capacitor having 6.00cm-diameter plates spaced 4mm apart. How much charge does the battery move from one plate to the other? Homework Equations V=Q/C C=A\kappa\epsilon/dThe Attempt at a Solution Plugged in...

1. What is the potential difference DeltaVab between points a and b when the switch is open? Closed? 2. DeltaV = IR 3. I solved I for the battery, which is 8A. What do I use for my R value to solve for DeltaV between a and b, though? I tried, for example, DeltaV = IR = 8A*6ohms = 48V. I guess...

Problem 5: Current, Energy and Power A battery of emf ε has internal resistance i R , and let us suppose that it can provide the emf to a total charge Q before it expires. Suppose that it is connected by wires with negligible resistance to an external (load) with resistance L R . a) What is...

I'm asking this question on behalf of another person who doesn't know english well. What he wants to know is the relationship between energy extracted from a battery and the corresponding reduction in mass of the battery, and if it would be possible to measure the difference with some type of...

Discharging a capacitor at a "battery like" rate We all know that capacitors discharge at a rate determine by the time constant of the circuit they are hooked up to (tau = RC). This discharge takes the form of a "dieing exponential" with respect to stored energy and likewise voltage. Capacitors...

Homework Statement A rechargeable AA battery with a mass of 25.0g can supply a power of 1.20W for 50.0mins. What is the difference in mass between a charged and an uncharged battery? Homework Equations W = Pt W = K = gmc^2 - mc^2 where g = 1/(1-(v/c)^2)^(-1/2) E (total) = gmc^2 = K...

the circuit is as shown. http://img186.imageshack.us/img186/6627/circuitg.jpg now i have to find the current from the battery. now the book says since the capacitor is charged its branch will no more have any current and we can neglect that branch. now my qs is. after the capacitor is...

Homework Statement does a flashlight battery have an internal resistance? explain. this problem is for my lab, and we are farther ahead in lab than in lecture. so i haven't actually learned this material yet. Homework Equations i'm not really sure. R=∆V/I also, -VB + VR + VM +...

Homework Statement To recharge a 5V battery, a battery charger must move 7x10^6 C of charge from the neg. to pos. terminal. How much work is done by the charger in joules? Homework Equations QV=U The Attempt at a Solution If the battery needs to be recharged, isn't the potential...

Homework Statement One rechargeable battery of mass 15.0 g delivers to a CD player an average current of 15.5 mA at 1.00 V for 2.50 hr before the battery needs to be recharged. The recharger maintains a potential difference of 2.00 V across the battery and delivers a charging current of 10.0...

I'm wiring together 25 rgb leds, each take 3V and I was wondering what would be the most efficient way to wire up as many as possible off one power source using resistors. Which resistors should I use? Series or Parallel? 9V or 12V battery? This is for a small project I'm working on myself...

Homework Statement A 12-V battery is connected to three capacitors in series. The capacitors have the following capacitances: 4.0uF, 14uF, and 33uF. Homework Equations R = V/I The Attempt at a Solution I'm thinking you add the capacitances since they are in series (do i need to...

Sorry if this is the wrong forum. When I just touch any part of the metal of both terminals on a 9V battery with a multimeters probes the meter displays the voltage (although it said 20V not 9V for some reason). What I'm wondering is why people don't get electric shocks from touching both...

Hye guys, I'm just a beginner in the area..i have a project of hand-cranked battery charger.. I supposed to improve the current charger in every way possible.. How could i the miniature generator, to generate the energy by turning the crank.. Is there any diagram that i can study or any...

I've got a 12V1.3AH/20HR battery and I tried charging it with my 12V solar pannels of 200mAh max output together (2 solar panels with 100mAh max designed for charging car battery trough cigarette lighter thing) but the solar panels their lights wouldn't go off meaning no power were given to the...

I'm attempting to figure out why my car isn't starting. I've reseated all the grounds and made sure the ground connections were clean and bare. I've cleaned the battery terminals and clamps with a wire brush as there was some corrosion on the terminals. I charged the battery two days ago due...

I'm having issues with overheating and need a little help. I have 8 6v4ah rechargeable lead-acid batteries. I wire 2 in series for 12 volts. Then i wire the sets of 2 in parallel, because I want to keep my system at 12 volts. That means I have 16 amps. Every time I add more sets of...

I've noticed that some devices (when they're low on battery charge) can be shut off and will regain some charge while they're off (if you leave them off long enough). What's going on here, physically?

Hi there, I have been doing research on a lil private project of my own, and am looking for some help. Would it make sense to use nichrome wire to build a heating element that will heat to 80-100 degrees? It seems that nichrome is great for heating way way past that temperature. I want to...

The Lead Acid Battery in my H-D '09 FXDF is rated 12V at 19Ah. If I understand the math correctly, I would need a 12V capacitor rated to 5,700F. Is this accurate? 1 F = 1 As/V 1 Ah = 3600 As 19Ah x (3600As/1Ah) = 68,400As (68,400As/12V) x (1F/[1As/V]) = 5,700 F As I understand it...

Any help is appreciated, I have a 11.1v battery system, an I would like to install a low battery indicator. I would like the indicator to be a single red LED that initiates when the voltage drops below 7v. Size is definitely a concern here. I have looked online at various templates, but I...

Homework Statement Two almost identical lead-acid accumulator batteries, X and Y, are connected with opposing polarities in a circuit which includes an ammeter, an ideal millivoltmeter and a resistor R as shown in figure below. When S1 is closed with S2 left open, the millivoltmeter reads 50...

Dear Experts, I am fascinated how a cell phone battery charger knows when the battery is fully charged such that it cuts off the power to prevent further charging. If its based on sensing a particular voltage has been reached, i wonder how is that achieved? Or is it achieved by measuring...

we have to build vehicle that can transport a d cell battery 7 meters as fast as possible using the potential energy of no more than 2 kilograms falling from 80cm. we want to use this design: http://www.scioly.org/w/images/6/69/SC-brake3diag.gif...

Homework Statement A 3.50 µF capacitor is charged by a 13.0 V battery. It is disconnected from the battery and then connected to an uncharged 4.44 µF capacitor (Fig. 17-29). Figure 17-29 Determine the total stored energy at the following points in time. (a) before the two...

Questions about Battery "Memory" I've heard that rechargeable NiCad batteries can be damaged so that they experience a large drop in voltage (and thus appear to be dead) before they are completely dead by being discharged to a point (like halfway) and then being recharged. Then I've heard that...

I have a first generation Apple iTouch 16 GB, and frequently download podcasts to watch and listen to. With over 1 million applications written, I have searched in vain to locate an application that will allow you to launch a video, and instead of displaying video and audio to suppress the...

Hi all, I'm trying to nail very precisely the effects of a battery in terms of charge separation. In particular: when and what points are excess charges seen in a typical circuit powered by a battery. A. Prior to wires being attached to the battery, you just have the battery itself. My...

Alright, so here goes, and by the way, this isn't homework, just in case you're wondering. Question 1: So, i have a 12vdc 500amp battery/car inverter and a 12vdc 11amp sump pump. If I wire it up, approximately how long will they last? Question 2: Also, I have a power inverter for my car, can I...

Could somebody give me detailed explanation how Li-ion chemistry works? For example,if Li ions (cathions) just migrate from one host material (such as graphite) to another (such as Cobalt oxide) where are electrons taken from to run in external circuit? In more common type of battery such as...

I am working on putting a new battery rack into a substation. I was re-reading the NESC and came across section 143. This section suggests it is not recommended to anchor my rack to both the floor and the wall. Can anyone explain why this is not recommended?

Here is a diagram of the circuit I am analyzing: http://www.sixtheorem.com/images/1.png I observe that bulb 2 does not light when the switch is closed. Could someone please explain what is happening here? And, what happens if I reverse the direction of battery B?

Hi everybody, I would like to use a 9V pp3 battery with a device with a rate of order of µA. Iwanted to use Peukert's law to calculate the duration of my battery but I am not quite sure if it is applicable for such low current... Won't a battery with 1200mAh capacity discharge too fast...