which can charge a cell phone in just 20 seconds A California teen has attracted the attention of tech giants Google for her potentially revolutionary invention which charges a phone in 20 seconds flat. The super-fast charging device has been dubbed a super capacitor by 18-year-old Esha Khare‚ of Saratoga - as she took home $50‚000 from the Intel International Science and Engineering Fair‚ which took place in Phoenix this week. The device will make waiting hours for a phone to charge a thing of
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bottom of electrode wire to keep the wire in position. Working – The polluted air enters from the bottom and flows upwards. The high voltage in the wire (50KV) ionizes the air. The negative ions move towards the ground surface and pass on their charge (negative) to the particles also. Then those negatively charged particles are electrostatically drawn towards the positively charged collector surface where they are finally deposited. The collecting surface is occasionally vibrated to remove deposited
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Nick Sarris‚ April 3‚ 2013‚ D-Bell Biology Virtual Electrophoresis Lab – Genetic Science Learning Center Use the link to complete the following lab. Submit through edline when you are finished http://learn.genetics.utah.edu/units/biotech/gel/ Title‚ name‚ date and bell (8 pts) Place your answer below the question and skip between questions (2 pts) Each question is worth 3 points 1. Why can’t DNA be sorted physically‚ using a microscope?- They are so tiny that they are unable to be
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with very high conductivity • Number of valence electrons is 4 with intermediate conductivity • Number of valence electrons is 5-8 with very low conductivity Semiconductor Conductors • Has more electrons that are free to move • Supports charge carriers to flow • Support flow of electricity • Has very low resistance allowing easy flow of electron current • Has less than 4 valence electrons – Examples: metals‚ electrolytes and ionized gases Insulators • Material with more than four
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protons‚ neutrons‚ and electrons. The protons and neutrons make up the nucleus‚ while the electrons are found outside the atom’s nucleus. Each component of an atom has a charge to it. The protons have a positive charge. The electrons have a negative charge‚ and the neutrons have a neutral charge. The atoms also have a charge. For example hydrogen can be negative‚ positive or neutral. These are called ions. H would be a neutrally charged hydrogen atom‚ while H- would be a negatively charged hydrogen
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A. Comparison of Volatility by Rate of Evaporation Volatility describes how easily a substance will vaporize (turn into a gas or vapor). A volatile substance can be defined as (1) a substance that evaporates readily at normal temperatures and/or (2) one that has a measurable vapor pressure. The vapor pressure of a substance is the pressure at which its gaseous (vapor) phase is in equilibrium with its liquid or solid phase. It is a measure of the tendency of molecules and atoms to escape from a liquid
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Charging a capacitor. Consider the series circuit shown in Fig. 1. Let us assume that the capacitor is initially uncharged. When the switch S is open there is of course no current. If the switch is closed at t=0‚ charges begin to flow and an ammeter will be able to measure a current. The charges move until the potential across the capacitor plates is equal the potential between the battery’s terminals. Then the current ceases and the capacitor is fully charged. R R C C Fig. 1. A capacitor
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Who Killed the Electric Car? is presented as a whodone- it mystery. Staying true to this genre‚ the film opens with necessary background information‚ describes the crime committed‚ answering all of the what‚ where‚ and when questions‚ and then in the style of Sir Arthur Conan Doyle gathers the suspects for close scrutiny‚ coming to a conclusion on the guilt or innocence of each. Opening with a bit of automotive history that establishes the electric car as a competitive alternative to the
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INTRODUCTION In 1791 Luigi Galvani discovered electrical activity in the nerves of the frogs that he was dissecting. He thought that electricity was of animal origin and could be found only in living tissues. A few years later‚ in 1800 Alessandro Volta discovered that electricity could be produced through inorganic means. In fact‚ by using small sheets of copper and zinc and cloth spacers soaked in an acid solution‚ he built a battery - the first apparatus capable of producing electricity. Naysayers
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boiling point and freezing point. Also‚ the atoms surrounding the polymer chains determine the charge (negative or positive). (For example‚ a Hydrogel chain (without the addition of Sodium atoms) is highly negative due to the Carbon atoms‚ and therefore will repel each other‚ causing a large‚ stretched molecule that has the ability to bond with positive atoms) [See diagram below]. These differing charges cause hydrophilic and hydrophobic groups. The hydrophilic groups absorb water‚ while the hydrophobic
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