The photon that is emitted from this second interaction has a lower energy than the one that caused it. The chemicals that make up the phosphor are chosen so that these emitted photons are at wavelengths visible to the human eye. The difference in energy between the absorbed ultra-violet photon and the emitted visible light photon goes toward heating up the phosphor coating. When the light is turned on, the electric power heats up the cathode enough for it to emit electrons (thermionic emission). These electrons collide with and ionize noble gas atoms inside the bulb surrounding the filament to form a plasma by the process of impact ionization.
The very basic operating principle of a battery is shown on the diagram below. The diagram of a simple cell. The anode and cathode of the battery is made up of two different types of metals. The metal with higher electronegativity becomes the cathode whereas the metal with lower electronegativity becomes the anode and are immersed in electrolyte. This provides potential difference
Introduction We are attempting to design an electron microscope that steers electrons with an electric field perpendicular to their initial direction of motion. In order to design this microscope, we need to determine how electric field strength affects an electron’s trajectory in a design like this. The electric field’s impact in this design is tested by modeling this situation with a Cathode Ray Tube (CRT). An electron beam is shot through the CRT and its deflection due to various perpendicular electric field strengths is measured. This data will be used to determine a function that relates electric field strength and deflection.
Ferromagnetic materials enhance the magnetic field of the electromagnet. Electromagnetic are devices that use electricity to generate a magnetic field. A magnetic field is created when the electric current flows through the entirety of the wire attached to the conductor and emitting a circular magnetic field. The direction of the magnetic field is dictated by the flow of electricity. The current is strongest near the center of the conductor carrying the current of electricity.
Solar Panels made from photovoltaic cells ( PV). Simply broken-down photo means light and voltaic related to the production of electricity. Solar Photovoltaic (PV) technology enables the creation of electricity using light intensity. PV cells have at least two layers of semiconductors, one that's positively charged, and one is negatively charged. When the light shines on the semiconductor material the electric field across the junction between these two layers causes electric current to flow.
The Sun’s energy which radiates into the Earth’s surface and harnessed by solar cells are composed of broad spectrum of electro-magnetic (EM) waves combined together which form visible light that have different power densities depending on the wavelength of propagation. The particular region of operation for crystalline silicon solar cell is the visible spectrum. Particle nature of light Light consists of energy carrying quantum-mechanical particles called photon. The energy of photon is directly proportional to the frequency of propagation. Energy of photons can be calculated using the equation E = hc/ λ or E(eV) = 1.24 / λ(μm) which give results in electron volts.
We then need to learn about the electrical properties of extrinsic semiconductors. Extrinsic semiconductor material is just a naturally occurring pure semiconductor material that has been modified by a developed process. Formula related to current and charge: Electric charge in a solid is carried by particles called electrons. One electron has a very small charge and so for handy measurement of electric charge we use units called
FOCUS QUESTION Description of the building product CITATION http://whatis.techtarget.com/definition/solar-power NOTES Definition: Solar is an energy efficient device that collects the sun’s light on the day then convert it to energy for use PV; photovoltaic are also called solar cells, It is used to convert sunlight directly into electricity. The name PV comes from the process of converting light (photons) to electricity (voltage), this is called the PV effect. Reflection Relevance for task FOCUS QUESTION Attributes that lead to energy efficiency CITATION https://en.wikipedia.org/wiki/Solar_cell_efficiency NOTES The efficiency of the solar cells used in a photovoltaic system, in combination with latitude and
This free electron is a charge carrier able to move within the conduction band when connected to a battery. There are two types of doping, N-Type and P-Type. (Refer to figure) N-Type doping is like mentioned above with the impurity element being phosphorus, there will be an “extra” or “spare” electron that is free to move around. P-Type doping the the opposite of N-Type, instead of
CHEMISTRY DIGITAL ASSIGNMENT -2 NAME: SANJANAA S REG.NO: 15BIT0010 FACULTY NAME: RAJAGOPAL D SLOT: D1 INTRODUCTION: A Fuel cell is a device that converts the chemical energy into electricity by the chemical process. The chemical reaction majorly consists of the positively charged hydrogen ions with the oxygen and other oxidizing agents. Basically fuel cells are the cells which converts the chemically energy into electricity but it is very different from the batteries. Fuel cell requires a continuous supply of oxygen and the fuels whereas the batteries run over the chemically present or stored in the battery itself and generates an electromotive source. The first fuel cell was invented in the early 17th century and the first fuel cell came