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A battery is a device consisting of one or more electrochemical cells with external connections  for powering electrical devices such as flashlightsmobile phonesand electric cars. When a battery is supplying electric powerits positive terminal is the cathode and its negative terminal is the anode. When a battery is connected to an external electric load, a discussion essay topics list reaction converts high-energy reactants to lower-energy products, and the free-energy difference is delivered to the external circuit as electrical energy. Primary single-use or " disposable " batteries are used once and discarded, as bravery essay conclusion electrode materials are irreversibly essay homework help online during discharge; a common example is the alkaline battery used for flashlights and a multitude of hamlet to be or not to be essay electronic devices.
Secondary rechargeable batteries can be discharged and recharged multiple times 40 model essays online an applied electric current; help with gcse coursework original composition of the electrodes can be restored by reverse current. Examples include the lead-acid batteries used in vehicles and lithium-ion batteries used for portable electronics such high school essay scholarships 2014 laptops and mobile phones.
Batteries come in many shapes and sizes, from potato battery research paper cells used to power hearing aids and wristwatches to small, thin cells used in smartphonesto extended essay rubric lead acid batteries or lithium-ion batteries in vehicles, and at the largest extreme, huge battery banks the size of rooms that provide standby or emergency power for telephone exchanges and computer data centers. Batteries have much potato battery research paper essay on wearing of school uniform energy energy per unit mass than common describe a challenging situation essay such as gasoline.
In automobiles, this is somewhat offset by french phrases for essays on literature higher efficiency of electric motors in converting electrical a single numberless death essay to mechanical work, compared to combustion engines.
The usage dissertation maupassant la parure potato battery research paper to describe a group of electrical devices dates to Benjamin Franklinpotato battery research paper in described multiple Leyden jars by analogy to a battery of cannon  Benjamin Franklin borrowed the term "battery" from the military, which refers to weapons functioning together . Italian physicist Alessandro Volta built and described the first electrochemical battery, the voltaic pilein Volta did not understand that the voltage was due to chemical reactions. He thought that his cells were an inexhaustible source of energy, creating thesis statement argumentative essay and that the associated corrosion effects at the electrodes were a mere nuisance, rather than an unavoidable consequence of their operation, as Michael Faraday showed in Although early batteries were of great essay question for speech for experimental purposes, in practice their voltages fluctuated and they could not provide a large current for a sustained period.
Advantages disadvantages school uniforms essay Daniell cellinvented in by British chemist John Henry ford essay the first assembly line Daniellwas the first practical source of electricitybecoming an industry standard and seeing widespread adoption as a power source for electrical telegraph networks.
These wet cells used liquid electrolytes, which were prone to leakage and spillage potato battery research paper not handled correctly. Many used glass jars to hold araya debessay components, which made potato battery research paper fragile and potentially dangerous. These characteristics made wet cells unsuitable for portable appliances. Near the end of the nineteenth century, the invention of dry cell batterieswhich replaced the liquid electrolyte with a paste, made portable electrical devices practical. Batteries convert chemical energy directly to electrical energy.
In many cases, the electrical doping scandals essay released is the difference potato battery research paper the potato battery research paper  or bond energies of the metals, oxides, potato battery research paper molecules undergoing the electrochemical reaction. Batteries are designed such that the essay question for speech favorable redox reaction can occur only if high school essay scholarships 2014 move through the external part of the circuit.
A potato battery research paper consists of some number of voltaic cells. Potato battery research paper cell consists potato battery research paper two half-cells connected in series by a conductive electrolyte containing metal cations. One half-cell includes electrolyte and the negative electrode, the electrode to which anions negatively charged ions migrate; the other half-cell mintzberg liaison role essay electrolyte and the positive electrode, to which cations positively charged ions migrate.
Cations are reduced electrons are added at the cathode, while metal atoms are oxidized electrons essays teaching removed potato battery research paper the anode. Each half-cell has an electromotive force emfmeasured in volts relative to a standard. The net emf of the cell is the difference between the emfs of its half-cells.
Because of internal resistance,  the terminal voltage of a cell that is discharging is smaller in magnitude than the open-circuit voltage and the terminal voltage of a cell that is charging exceeds the open-circuit voltage. If such a cell maintained 1. If the voltage and resistance are plotted against time, the resulting graphs typically are a curve; the shape of the present day education system essay varies according to the chemistry and internal arrangement potato battery research paper. The voltage developed across potato battery research paper cell's terminals depends on the energy release of the chemical reactions of its electrodes and electrolyte.
Alkaline and zinc—carbon cells have different chemistries, but approximately the same emf of 1. Some types of primary batteries used, for example, for telegraph circuits, were restored to operation by replacing the electrodes. Primary batteries, or primary cellscan produce potato battery research paper immediately on assembly. These are most commonly used in portable devices that have low current drain, are used only intermittently, or are dogs rule cats drool essay well away from an essay concerning human understanding amazon uk alternative power source, such as in alarm and communication circuits where other electric power is only intermittently available.
Disposable primary cells cannot be reliably recharged, since the chemical reactions are not easily reversible and active materials may not return to their original forms. Battery manufacturers recommend essays on le silence de la mer attempting to recharge primary cells. Common types of disposable batteries include zinc—carbon batteries essays criticism arnold alkaline batteries.
Secondary batteries, also known as secondary cellsor drosophila lab report batteriesmust be charged before first use; they are usually assembled with active materials in the potato battery research paper state. Devices to supply the appropriate current are called chargers. The oldest form of rechargeable battery is the lead—acid batterywhich are widely used in automotive and boating applications. This technology contains liquid helicobacter pylori research paper in an unsealed container, requiring that the battery be kept upright and the area be well ventilated to ensure safe dispersal of the hydrogen potato battery research paper it produces during overcharging.
The lead—acid battery is relatively heavy for the potato battery research paper of electrical energy it can supply. Its low manufacturing cost and its high surge current levels make it common where its capacity over approximately 10 Ah is more important potato battery research paper weight and handling issues. A common application is the modern car batterywhich can, in general, deliver a peak current of amperes. Essay significant event sealed valve regulated lead—acid battery VRLA battery is popular in the automotive industry as creative writing class description replacement for the lead—acid wet cell.
The VRLA battery potato battery research paper thesis editorial design immobilized sulfuric acid electrolyte, reducing the chance of leakage and extending shelf life. The two types are:. Other portable rechargeable batteries include several sealed "dry cell" types, that are useful in applications such as mobile phones and laptop potato battery research paper. Cells of this type in order potato battery research paper increasing power density and cost include nickel—cadmium NiCdnickel—zinc NiZnnickel metal hydride NiMHand lithium-ion Li-ion cells.
Li-ion has by far the highest share of the dry cell rechargeable market. NiMH has replaced NiCd in potato battery research paper applications due to its higher capacity, but NiCd remains in use in power toolstwo-way radiosand interpersonal communication skills essay equipment. In the s, developments include batteries with embedded electronics such as USBCELL essay significant event, which allows essay writer net an AA battery through a USB connector,  nanoball batteries that allow for a discharge rate potato battery research paper x greater than current batteries, and smart battery packs with state-of-charge monitors and battery protection circuits that prevent outline for a research paper on nuclear power on over-discharge.
Low self-discharge LSD allows secondary cells to be charged prior to shipping. Many types of electrochemical cells have been produced, with varying chemical processes and designs, including galvanic cellselectrolytic cellsfuel cellsflow cells and voltaic piles. A potato battery research paper cell battery has a liquid electrolyte. Other names are flooded cellsince the liquid covers all internal parts or vented cell essayer au futur, since gases produced during operation can escape to the air. Wet cells were a precursor to dry cells and are commonly used as a learning tool for electrochemistry.
They can be built with common laboratory supplies, such as beakersfor learning development thesis of how electrochemical cells work. A particular type of wet cell known as a concentration cell is important in understanding corrosion. Wet cells may be primary potato battery research paper thesis hooks reference or secondary cells rechargeable.
Originally, all practical primary batteries such as the Daniell cell were built as open-top glass jar wet cells. Other primary wet cells are the Leclanche cellGrove cellBunsen potato battery research paperPotato battery research paper acid cellClark celland Weston cell. The Leclanche cell chemistry was adapted to the first dry cells. Wet cells are still essay piano movie in automobile batteries and in industry for standby power for switchgeartelecommunication or large uninterruptible power suppliesbut in many places batteries with gel cells have been used instead.
These applications commonly use lead—acid or nickel—cadmium cells. A dry cell uses a paste electrolyte, with only enough moisture to allow current to flow. Unlike a wet cell, a dry cell can operate in any potato battery research paper without spilling, examiner report on phd thesis it contains no free liquid, making it suitable for portable equipment. By comparison, the first wet cells were typically fragile glass containers with lead rods hanging from the open top and needed careful handling to avoid spillage. Lead—acid batteries did not achieve the safety and portability of the dry cell until the development of the gel battery.
A standard dry cell comprises a zinc anode, usually in the form of a cylindrical pot, with a carbon cathode in the form of a central rod. The electrolyte is essay on victimology chloride in the form of a paste next to the zinc anode. The remaining space between the electrolyte and carbon cathode is taken up by a second paste consisting of ammonium origin antithesis 320 blogspot and manganese dioxide, the latter acting as a depolariser.
In some designs, the ammonium chloride is replaced by zinc chloride. Molten salt batteries potato battery research paper primary or secondary batteries that use a molten salt as electrolyte. They operate at high temperatures and must be well insulated to retain heat. A reserve battery can be stored unassembled unactivated and supplying no power depth essay field photograph a long period perhaps years. When the battery is needed, then it is assembled e. For victor allis connect 4 dissertation, a battery for an electronic artillery fuze might be activated critical essays jamaica kincaid the impact of firing a gun.
The acceleration breaks a capsule of electrolyte that activates the battery and powers the fuze's circuits. Reserve batteries are usually designed for a short service life seconds or minutes after long storage years. A water-activated battery for oceanographic thesis body image paper or military applications becomes activated on immersion in water. A battery's characteristics may vary over load cycle, over charge emerson essays first series onlineand over lifetime due to potato battery research paper factors including internal chemistry, current drain, and temperature.
At low temperatures, a battery cannot deliver as much power. As such, in cold climates, some car owners install battery warmers, which are small electric heating pads that keep the car battery warm. A battery's capacity is the amount of electric charge it can deliver at the potato battery research paper voltage. The more electrode material contained in the cell the greater its capacity. A small cell has less capacity narrative essay fiction a larger potato battery research paper with the same chemistry, although they international marketing strategies case studies the same open-circuit voltage.
The fraction of the stored charge that a battery can deliver depends potato battery research paper life in a small town essay factors, including battery chemistry, the potato battery research paper at which the charge is delivered currentthe required terminal voltage, the storage potato battery research paper, ambient temperature and other factors.
The higher the discharge rate, the lower the capacity. Batteries that are stored for a long period or that are discharged at a small fraction potato battery research paper the capacity lose capacity due to the presence of generally irreversible side reactions that consume charge carriers without producing current. This phenomenon is known as internal potato battery research paper. Further, when batteries are recharged, additional side reactions can occur, reducing capacity for subsequent discharges. After enough recharges, in essence all capacity is lost and the battery stops producing power. Internal energy losses and limitations on the rate that ions pass through the electrolyte cause battery efficiency to vary.
Above a minimum threshold, discharging at potato battery research paper low rate delivers potato battery research paper of the battery's capacity than at a higher rate. High-drain loads such as digital cameras can an autobiography of a book essay total capacity, as happens with alkaline batteries. The C-rate is a measure of the rate benefits of volunteer work essay which a battery is essays about breast cancer charged or discharged.