Battery Definition and 1000 Threads

Homework Statement An engineer is trying to model a lithium battery with a thevenin equivalent circuit. She first connects a voltmeter across the battery and gets a reading of 3.7V. She then connects 0.5 Ohms resistor across the battery terminals. The reading now drops to 3.2V. Draw the...

is it safe to wire like 4 turnigy 11volt 2200mah 25c lithium polymer batteries in series and 4 in parrell using dean connectors? The reason I am asking is becuase I see some battery packs online that are expensive for the power they output. If lithium polymer is unsafe is it safe to use smaller...

I just picked up a TI-NSpire for nearly nothing. It's missing the battery door for the rechargeable battery (which is also missing). I can pick up the battery easily enough but I can't find the door anywhere! See the door (and it's screws ... which of course I don't have either) in the pic...

In a standard galvanic half-cell when Zinc rode is placed into the Zinc sulphate. What is the reaction which makes zinc to dissolve and fell into the solution. Why do electrons move away from the sides of the electrode? Are they repelled by the solution or by other ZN atoms on the electrode...

Who is the trigger of the oxidation reaction. Copper which attracts electrons from the Zinc or solution which makes Zinc losing electrons and become positively charged. I am struggling to understand what actually makes Zinc to enter the solution and leave 2 electrons behind. If there is no wire...

Who is the trigger of the oxidation reaction. Copper which attracts electrons from the Zinc or solution which makes Zinc losing electrons and become positively charged. I am struggling to understand what actually makes Zinc to enter the solution and leave 2 electrons behind. If there is no wire...

Hi fellows. Are batteries connected in parallel better than battery connected in series ? Think of two circuits , with 1 identical bulb each circuit.The first circuit is connected with a battery in series , and the battery in the second circuit will be connected in parallel (2 batteries). Which...

Homework Statement When a nonideal battery is connected to a 3.0-Ω resistor in a circuit, the current in the circuit is 2.0A . When the same battery is connected to a 1.0-Ω resistor in a circuit, the current in the circuit is 3.0 A. What is the internal resistance of the battery? What is the...

I have 2 large battery banks .Each bank is monitored to a information accumulator which keeps track of battery use and amp-charge input. each bank has a voltage shunt for amperage input the information accumulator(Link2000 which take care of 2 battery banks) is bad and not to be found.The only...

If bidder applies one UPS (Dual redundant type) system for DCS, ESD, FGS and Telecom in CCB, Satellite rack room and Substation as company recommended, what is the UPS battery autonomy time among 1 hour and 4 hours? how to calculate it?

I mean on the actually anode, what is the usual net charge around? How many extra electrons to protons are there? The reason I ask is because I'm confused what causes the voltage, is it the higher charge density relative to the other plate?

If CCA can be translated directly to Amps then would I be able to run the battery at max capacity for only 3.6 minutes? 18 / 300 * 60 = 3.6 Minutes? Or am I looking at something wrong?

So I understand that a battery consists of an anode, cathode, and electrolyte. Question: What is the function of the electrolyte? Can we use a conductor instead of an electrolyte like some kind of metal? If so, why don't we? Now for a penny and nickel battery stacked on top of each other you...

Consider a wire connected to a battery. Now,potential is analogous to the energy of the particles.And potential in a resistor drops because of the friction inside the resistor(considering there is no friction along the wire and outside the resistor).So the friction determines how much energy is...

Considering that the electric field exist outside a battery in a wire,shouldnt the potential drop while we move along the wire even if there is no resistor(E=grad(V))?Because when i see diagrams of potential along the wire,they all show a constant potential along the wire until it reaches a...

Correct me if I'm wrong,but a battery's electric field is like an electric field of a capacitor consisting of two plates.But we know that the electric field outside the two plates is zero.So why does an electric field form outside the battery and into the circuit?

Anyone know what the specification of EU1L is in a garden tractor battery? I am assuming "U" is utility, and "L" is the positive terminal post faces left viewing the battery's face or front. If so, what is the "E" and "1"?

Hi! Iam a new guy here. Iam not a physicist, rather veterinarian. i have a doubt. I have Car DVR with 3.7V , 300mAH LIPO battery. Can i replace that with say 3.7V, 1000 mAH /2000mAH LION battery? Will it be a problem? In the current setup the LIPO battery is inside the DVR and DVR is getting...

A battery is rated as follows: 2600 mah 12 V 5C My question is what does each of these values mean? 2600 mah is the "capacity" of the battery. To my understanding this means you can draw 2600 ma current from this battery for exactly one hour; after one hour the battery is dead. Or you can...

Homework Statement A 8500 Ω resistor is joined in series with a 80 μF capacitor. a) What is the capacitive time constant of this combination? (Solved: 0.65 s) b) If a 9.0 volt battery is suddenly connected across this RC combination, how long will it take for the capacitor voltage to reach 8.0...

Hi :) It might seems a stupid question but I can't find any answer for it ^^ I have a question: how voltage is calculated in a battery? Let's say you create a battery with - 1 C of charge of electrons on the and the other side + 1 C of charge, could you tell me what is the voltage of this...

New to the forum :) We were (trying to) discussing this at work the other day. Consider a simple battery powered circuit, with a resistor and an LED. With a battery, current is "chemically produced" in the battery and flows from the positive to the negative pole, passing through the LED...

I have a motorcycle battery which is 6Ah, with a maximum charging current of 0.6A/h. Is there a method of charging it whilst using a 2.7Adc (4A RMS) charger? I was thinking using resistors in parallel or series between the charger and the battery, but I am not sure exactly how.

Homework Statement The two headlights of a car sonsume a total power of 120 W. A driver parks the car but leaves the lights on. The 12-V battery is rated at 95 A * h. Homework Equations P=IV V=IR The Attempt at a Solution I don't know any equation that associates this with time. [/B]

Homework Statement Find I1 , I2 and I3 Homework Equations I = E / R I3 = I1 - I2 The Attempt at a Solution its the trouble with parallel different emf . I know a formula how to combine them into one but it needs inner resistance . i don't know how to do it with the ideal circuit . The...

In a circuit there are two forces that act on the charges to keep the current uniform through out, ##\vec{f}=\vec{E}+\vec{f_s}##, where ##\vec{E}## is the electrostatic field and ##\vec{f_s}## is the electric field produced by chemical reactions. Inside an ideal battery, ##\vec{E}## and...

Hi, does anyone know if this is possible? It's a large tv and would use about 500w, I was hoping to use a 48V100ah lithium battery pack.

Hello Guys and Girls, I wanted to know if my HYBRID HONDA CIVIC 2010 would still start up and run if my hybrid battery pack dies ? If it gets started and i am able to drive it, will it affect the car anyhow (apart from few MPG less) on a long term ? Thanks in advance. N.R.

Let me start by saying that the point of this question is to figure out if I can do this with items on hand instead of buying a UPS. I have a cable modem and wireless router which require 12V 750mA and 12V 1000mA respectively. In the event of a power outage, I'd like to be able to manually...

Greetings, in a small project I'm doing, I need to have a small speaker literally touching the outside of a lithium-Ion battery. Will there be any negative results to these devices being in such close proximity? e.g. noise introduced into the speaker, or odd behavior induced upon the battery? If...

I know I've done this before but for some reason I am stuck. I have a smoke alarm where the battery compartment is being blocked by the permanent power. I can't disconnect or a monitoring alarm will trip (i think?). There is a great deal of tension here and any more force I feel will break the...

Just got a jump start due to having left my trunk ajar last night. Battery was pretty dead ~8.5V. Dead enough that we had to let the jumper car charge it for 10 minutes before it would start. So now it is running in my driveway. How long do you think it will need to charge before it will be...

Will a high current destroy my smartphone battery? I know very little about batteries, but I'm getting really annoyed at having to wait 8 hours for my phone battery to charge (it's a 6 year old smartphone). So I was thinking of raising the 2.1A output of the charger to 3.1A without raising the...

Suppose you have a full battery and an empty one, both the same type, and you hook up positive to positive and negative to negative, and for this particular battery chemistry, the difference in voltage is great enough to commence charging of the negative one. How much current would likely travel...

An electrolyte is neutral, so what allows it to conduct exclusively positive ions in a battery and not electrons?

Water is a conductor of electricity. So if i throw a normal clock or tv remote battery in a bucket of water, will it conduct the electricity, allow a short circuit between the + and - ve terminals and cause some minor explosion? I wanted to try it but got scared. What will happen if i connect...

I know how to calculate current flow across a resister from the voltage, but what about current flow into a battery? Do I need to put a resister in the system so that I know how much current is flowing, or does that drop the voltage to the battery too much? I'm guessing the battery has an...

They have a nominal voltage of 3.7V or 3.6V. They are charged at 4.2V, and disconnected when the charger says 4.0V. Does that mean they are 3.6V when they are empty, or are they overchaged when they are 4.0V? How low in voltage can they go and still have plenty of current? Thanks. I'm designing...

I'm shopping for a battery-powered USB charger. Someone on Amazon says that as current (amperes) increases, battery life decreases exponentially. He says that using a charger with a current of 500mA gets you 30% more total power from the AA batteries than if you used a charger with a current...

So I have an old flip phone here that I wanted to turn into a portable battery pack because its winter break and I am bored. Whole thing is apart and good to go but I was wondering if there is any way to reverse the current. Obviously charging it one way, and then when you use it as a battery...

Homework Statement Students are given some resistors, a battery with internal resistance, and an ammeter. They are asked to determine the emf e and internal resistance of the battery using just this equipment. Working with the circuit shown at right, they insert each resistor into the circuit...

Hey guys! I have been following the forum for quite some time now. With all of you smart people out there, I am hoping you can help me design a heater, or at least lead me in the right direction. What I am attempting to create is a battery powered heater, to maintain a temperature of...

More of a general question but thought I'd post it here. Motorcycles are notorious for losing battery charge and not starting requiring a jump or rolling start. Was looking to get one of these new Li-ion battery / jump start modules capable of starting a car (and charging a phone or tablet)...

I am trying to create a flowchart that will help solve a series of unknown simple circuit setups hidden within a box. It is powered by a 9v battery. There are 12 different probes that connect to 1 common ground and I want to have a method to discover what is contained. Options include 3...

Lithium ion batteries infamously degrade over time. 1000 charges can cause up to 20% loss in capacity. Is there a type of rechargeable battery that will not degrade over time?

Homework Statement [/B] The main problem is if it is safe to charge a solar battery as quickly as possible assuming that I have a large current charger. Let's say I have: 70Ah Solar Battery 50 F, 15 V Ultra Capacitor C = Q/V Q = CV = (50)(15) = 750 I = Q/t It = Q = 750 Ampere-second E = 15...

< Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown >[/color] Hey guys , I want to know about the battery defects like stipulation , erosion , sedimentation , seperator defects .

I'm a Automotive engineer and hence lack the electrical engineering expertise that you might expect. This is related to a doubt I have in calculating the final battery voltage for an electrical vehicle. This is just a calculation query. I have a module consisting of 12 individual Li-ion cells...

Hello everyone! I'm almost done with a project of mine and I'm creating a battery with an aluminum casing around. Inside I have a copper electrode (cathode) and due to lack of finding a correct dimension I have to resort to using a stainless steel anode (and I'm also running out of time) So I...

1. Consider the group of resistors in the figure, where R1 = 12.3 and R2 = 7.95http://www.webassign.net/images/omegacap.gif. The current flowing through the 7.95[PLAIN]http://www.webassign.net/images/omegacap.gif resistor is 1.22 A. What is the voltage of the batter...