Calculating Battery Amp Hours

Frequently we get asked how to compute or calculate how amp hours the client needs to run a gadget or various gadgets. Ampere-hours, or amp-hours, are regularly used to describe the energy capacity of batteries, in spite of the fact that they can be utilized to calculate the required load for any electrical scenario. To calculate amp-hours from watts, you have to use equivalent terms: either the number of watt-hours or how long something works at a specific number of watts. Couple this with voltage, and you can simple ascertain amp-hours. This may seem a bit trick but with the necessary guidelines and proper calculation, determining this is not such a tedious task.

Step 1

Multiply the number of watts by the number of hours to calculate watt-hours. For instance, in the event that you know your laptop computer uses 30 watts of power and you need a battery to power it for four hours, you need 120 watt-hours of stored energy.

More information on how to properly calculate amps per hour can be found here.

Step 2

Divide this figure by the energy productivity of the battery to adjust for the lost energy. The battery's proficiency is listed in its particulars. In the example, if the battery has an 85 percent proficiency, you divide 120 by 0.85 to derive a required 141 watt-hours. In the event that you wish to ascertain just theoretical values, you can skip this step.

Step 3

Partition this figure by the voltage to calculate amp-hours. Voltage is additionally listed in the battery's particulars. In this example, if the battery is evaluated at 19 volts, divide 141 watt-hours by 19 volts. This tells you your new battery needs at least 7.42 amp-hours to run your computer for four hours.

Some battery chemistry gives much fewer amp hours if you discharge them fast. This is known as the Peukart effect. This is a major effect in alkaline, carbon zinc, zinc-air and lead-acid batteries. For instance, if you draw at 1C on a lead-acid battery you will just get half of the capacity that you would have gotten if you had drawn at 0.05C. It is a small effect in NiCad, Lithium Ion, Lithium Polymer, and NiMH batteries.

For lead-acid batteries, the rated capacity (for example the number of AH stamped on the side of the battery) is ordinarily given for a 20-hour discharge rate. If you are discharging at a moderate rate, you will get the evaluated number of amp-hours out of them. Notwithstanding, at high discharge rates the capacity falls steeply. A standard guideline is that for a 1-hour discharge rate (for example drawing 10 amps from a 10 amp hour battery or 1C) you will just get half of the rated capacity (or 5 amp-hours from a 10 amp-hour battery). Diagrams that detail this effect for various discharge rates can be utilized for more prominent precision. If you followed the above steps properly, then you can now accurately calculate battery amps per hour.

Bringing About Social Change With Mobile Phones

The number of mobile phone users has increased exponentially in the past few decades. It was estimated that by the end of 2011 there were around 6 billion mobile phone subscriptions in the world, which is a huge number when you consider that the population of the world in 2011 was just under 7 billion. That is not to say, however, that almost everyone in the world has a mobile phone subscription, rather, that many people will be in possession of one or more phone subscriptions. Still, it is a huge number. The majority of people in the UK will use their phone every day, either to call someone, send a message or go on the internet. For UK users the main use of a mobile phone is to keep in contact with friends and family. The mobile phone is, however, increasingly being used to improve lifestyle, healthcare, education and standard of living, both at home and around the world – particularly in developing countries.

Charities, medical organisations and individual app developers (among others) have been quick to realise the positive potential of the mobile phone. The use of different applications or ‘apps’ on mobile phones can help to improve the quality of life for many people. Visiting the ‘app store’ on your phone you may find any number of games and fun applications, but many developers are also creating apps that can help to improve the way people live their lives all around the world. Mobile phone technology brings a sense of connectivity and community that can help health, education and non-profit organisations in their projects.

It may be surprising to learn that the majority of handsets produced are still feature phones (i.e. not smartphones). Though many people in the world do have smartphones with internet connectivity and high levels of processing power, even more still use ‘candy bar’ or ‘flip’ feature phones. The previously mentioned apps are created in some instances for smartphone users but just as many are designed to work on feature phones. It has been put forward by some observers that the constraints of feature phone technology, i.e. the lack of functionality in comparison with smartphones, has spurred on creativity rather than hindered it. App creators for feature phones have to think in more creative and out-of-the-box ways to deliver results.

There are many different ways that mobile technology can be used to improve people’s lives. One of the most common areas that it is being utilised in is in the health sector. Mobile phone technology, even basic SMS capability, can make a huge difference in low income and rural areas. Many health organisations, many of which are based in African countries, are using mobile phone technology in the fight against malaria. Health care workers and volunteers that are working in remote areas can send data and reports using mobile phones. This means that central medical clinics and hospitals can have information immediately and do not have to wait for long periods of time while workers are travelling back to the clinics with their information. Read the rest of this entry »

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Features Of Android And IOS

iOS And Android are the two most popular and user-friendly operating systems that are being used for mobile devices. Both of these applications are packed with advanced features and application ecosystems.There are visible differences in Android phone and iOS. Truly speaking, it is a well considered decision to select either a tablet or Smartphone for personal use. Android is known as the most commonly used platform that is widely used by phone manufactures. Contrary to Android, iOS is specifically used by Apple devices like iPhone.

Comparison Between iOS and Android

iOS and Android have admirable features that can easily grab the attention of users to purchase these applications. With iOS, we can enjoy the delivery of newspapers, magazines, iMessages to iOS users, and get easy to read format of web pages etc. It supports Java Script and offer Siri for more coverage. Siri is capable of giving answers regarding stats, sports, movies and reviews. If you want to know about the best restaurants or open places, Siri is always ready to provide its services. iOS has offered Apple Map that can provide you the 3D view of cities, warning about accidents, traffic information, and road construction. There are some drawback of iOS and one of the basic weaknesses of this operating system is related to lower OS version. These versions are totally vulnerable and can be very easily hacked by system hackers.

Android offers unlimited features and helps its users to navigate with intuitive gestures. The ice-cream sandwich is one of the remarkable characteristic of Android phones. The readability has been improved by high resolution screen and conveys an advanced look for the user interface. The key strength of Android is multitasking attribute and supports the user to jump from one job to another with the help of system bar list. Android provides a list of rules related to system access to its users. These security locks can be adjusted at the time of the application installation. All the data on android phones can be stored in Gmail account. It is beneficial for users that they can retrieve their important contact, messages or personal information by logging in to their Gmail account. Just like iOS, Android has some pros and cons. The basic problem with this operating system is related to inefficiencies of android phone to get updates to the latest version. Read the rest of this entry »

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