_Futur+ways+to+recharge+your+smartphone

Subject: By: LONGIN Jérémy
 * Future ways to recharge your smartphone **

Plan:

1. Introduction 2. Challenges for the future 3. Different technical a. Solar Power b. Kinetic energy c. Thermic energy 4. <span style="font-family: 'Trebuchet MS',sans-serif; font-size: 16pt;">References


 * <span style="font-family: 'Trebuchet MS',sans-serif; font-size: 24pt;">1. ** <span style="font-family: 'Trebuchet MS',sans-serif; font-size: 21px;">Introduction

<span style="font-family: Arial,sans-serif; font-size: 11.5pt;">Nowadays, the biggest problem for technologies is energy. While we are at home, at work, at friends, we have access to a source of energy, but as soon as we are outside we need energy for our smartphones. Developments of new technologies offer us different solutions like for example solar power, kinetic energy or thermic energy.


 * <span style="font-family: 'Trebuchet MS',sans-serif; font-size: 24pt;">2. ** <span style="font-family: 'Trebuchet MS',sans-serif; font-size: 16pt;">Challenges for the future

<span style="font-family: Arial,sans-serif; font-size: 11.5pt;">With the development of new technologies, battery duration is more and more important. Whereas old phones had an important autonomy (1 week), smartphones and connected watch have only 2 or 3 days. <span style="font-family: Arial,sans-serif; font-size: 11.5pt;">Important resources are allocated by the majors companies to find new ways to charge batteries. The first challenge is commercial: more than a billion of smartphone was sold in 2013.


 * <span style="font-family: 'Trebuchet MS',sans-serif; font-size: 24pt;">3. ** <span style="font-family: 'Trebuchet MS',sans-serif; font-size: 16pt;">Different technical
 * <span style="font-family: 'Trebuchet MS',sans-serif; font-size: 18pt;"> a. ** **<span style="font-family: 'Trebuchet MS',sans-serif; font-size: 13pt;">Solar Power **

<span style="font-family: Arial,sans-serif; font-size: 11.5pt;">Up to now, reloading this mobile with Solar power have big inconvenient to requires external peripheral. With third generation <span style="font-family: Arial,sans-serif;">photovoltaic <span style="font-family: Arial,sans-serif; font-size: 11.5pt;">, solar cell become more transparent with 40% light transparency in 2013 (1), and permit new application: film screen protection which reloading your cell, glass-house will be new electrical outlet… <span style="font-family: Arial,sans-serif; font-size: 11.5pt;">In 10 year, solar cells efficiencies has been increased to 50% (2 ) and cost divided by 3 (3). By extrapolation, we can affirm that in few years, this technology will be integrated directly in mobile screen (4). In this way, the phone’s battery up to 20% without effort and totally ecological way


 * <span style="font-family: 'Trebuchet MS',sans-serif; font-size: 18pt;">b. ****<span style="font-family: 'Trebuchet MS',sans-serif; font-size: 13pt;">Kinetic energy **

<span style="font-family: Arial,sans-serif; font-size: 11.5pt;">Another way to charge a smartphone battery is to use the kinetic energy of the user. Kinetic energy is created when it move, while the user is walking or just using is phone. <span style="font-family: Arial,sans-serif; font-size: 11.5pt;">Because of the needs of smartphone and it low weight; this method is not enough to supply a smartphone. It begins to be developed with the decrease of battery requirements, and can also be used in smartwatch. However, it could be added with others technologies like solar power or thermic energy. <span style="font-family: Arial,sans-serif; font-size: 11.5pt;">If this method is not used yet, some chargers exists how allow you to recharge your battery with kinetic energy. You only plug it like a traditional charger and shake it for a while.


 * <span style="font-family: 'Trebuchet MS',sans-serif; font-size: 18pt; line-height: 1.5;">c. ****<span style="font-family: 'Trebuchet MS',sans-serif; font-size: 13pt; line-height: 1.5;">Thermic energy **

<span style="font-family: Arial,sans-serif; font-size: 11.5pt;">This technique consists to use body warmth to create electricity. It uses a difference of temperature between the inside layer and the outside (of a sleeping bag for example), this is called the Seedbeck effect. This technology functions with thermoelectric materials that can use this effect to create a voltage between the two sides so we can connect a smartphone or a tablet, for example to charge it battery. <span style="font-family: Arial,sans-serif; font-size: 11.5pt;">This technology must have a good future because, according to the creators, 8 hours in the sleeping bag will provide 24 minutes of talk time and 11 hours of standby time which it can be an enough charge for a day of use if we are in a forest for example.

<span style="font-family: Arial,sans-serif; font-size: 11.5pt;">1) Solar Power:
 * <span style="font-family: 'Trebuchet MS',sans-serif; font-size: 24pt;">4. ** <span style="font-family: 'Trebuchet MS',sans-serif; font-size: 16pt;">References
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<span style="font-family: Arial,sans-serif; font-size: 11.5pt;">(2) <span style="color: #1155cc; font-family: Arial,sans-serif; font-size: 11.5pt;"> <span style="font-family: Arial,sans-serif; font-size: 11.5pt;">(3) <span style="color: #1155cc; font-family: Arial,sans-serif; font-size: 11.5pt;">[] <span style="font-family: Arial,sans-serif; font-size: 11.5pt;">(4) <span style="color: #1155cc; font-family: Arial,sans-serif; font-size: 11.5pt;">[]

<span style="font-family: Arial,sans-serif; font-size: 11.5pt;">2) Kinetic Energy:
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 * <span style="font-family: Arial,sans-serif; font-size: 11.5pt; vertical-align: baseline;">http://www.trendhunter.com/trends/wise-pad

<span style="font-family: Arial,sans-serif; font-size: 11.5pt;">3) Thermic energy:
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