Tecno Bil

Dear Pupils,
Leave here all the comments and suggestions you like. I hope we will have a course full of good things.

Remember: 1) I am at your entire disposal here or email for pupils (see antoniocuestas.com)

2) Check former blogs (see links, enlaces a cursos pasados) if you need more materials for your lessons

Anuncios

6 pensamientos en “Tecno Bil

  1. Plastics
    Comenzamos con los plásticos. Su lenguaje es complicado en español así que en inglés más. Pero no os preocupéis veréis cómo con las clases, actividades y proyectos que haremos con ellos los aprendéis. Aprovecho las notas que tomó vuestra compañera Aida, gracias Aida, para ir empezando con el vocabulario. Las notas están tomadas por ella en clase, hay algún pequeño comentario que hacer y las repasaremos y corregiremos en clase pasado mañana. Ciao¡
    ¡¡Tenéis que poneros las pilas para el examen de los plásticos!! “You have to put the batteries in” (Traducción propia)

    UNIT 1: PLASTICS
    ‘polymer==> ‘POLYMERIZATION/ai/

    Plastic-plástico
    Capacity to change and adapted the shape-capacidad de darles forma
    They can be coloured-pueden ser coloreados, (dye-teñir)
    They are light-son ligeros
    They have a very good insulation(aislante) from electricity and heat-son buenos aislantes de la electricidad y el calor
    Good mechanical re’sistance
    Very resistent to acids, atmospheric agents, corrosives but at the same time its great inconvenience. Difficult to recycle it.
    Accumulation causes serious problems for the environment
    CLASIFICATION

    There are two big groups:
    -Thermoset (termoestables): you can only shape/mould/form once (solo les puedes dar forma una vez)
    -Thermoplastic (termoplásticos): you can shape them as often as you like (les puedes dar forma las veces que quieras)

    *Thermoset:
    Phenoplast

    Bakelite -used in the electronic circuits (se usan en circuitos electrónicos), plaques
    handles
    Aminoplast:
    Melamine Used for covering surfaces
    Polyester ‘tergal, terlenka==> don´t crease, they dry very quickly
    Mixturing with fibreglass it is very useful for e.g. canoes /ka’nus/
    Cellulosic plastic
    Cellulose ace’tate /seliolous/ Used for transparencies

    Polyethylene bottles, containers, plastic bags. North Sea gas==>pipes
    Polyethylene terephthalate \ˌter-ə(f)-ˈtha-ˌleit\(PET), plastic bottles (e.g.mineral water)
    PVC, Initial letters don’t confuse with ‘acronyms
    Polyvinyl chloride \ˌpä-lē-ˈvī-nəl\//cl’oraid/

    used in: containers, fall pipes (rain) or drain pipes (toilet)
    windows frames, electric cable covers, boxes for electrical installations

    Poly(methyl methacrylate) (PMMA)\ˈpä-lē-ˌme-thəl-\polimezl mezacrileit
    It is v. transparent, for optical lenses, signs for companies or for ex. when you go out of this building (main entrance) you can see one(Misioneras Claretianas)
    It is resistant so we can use it in aircraft windows-
    To protect photos its the best, keyrings.

    Polystyrene (pronounced /ˌpɒliˈstaɪriːn/) )
    good mechanical resistence, very useful for outdoor furniture, pens,

    Expanded polystyrene which is very useful as foam packaging

    Polypropylene\ˌpä-lē-ˈprō-pə-ˌlin\ (PP) videocases, syringes, the exterior of a car battery (case),cords, rafia,

    Nylon
    test-tube
    NY-LON
    Very resistant, forms threads/e/easily. Used for gears, textiles (textails/, (cords,ropes)

    Recycling of plastics
    . Don´t desintegrate with the passing of time//Don´t degrade or decompose over time
    . Accumulation causes serious problems for the environment
    . We have to recover other types of material (Al, glass, paper…)

    Recycling is collecting and transforming materials that are considered rubbish into useful products
    Selective collection makes it easier
    The main problem is separating and clening, expensive and complicated
    Effectiveness: depends on citizenship collaboration
    4 types of recycling
    Primary: from waste, we get plastics with the same properties as the original
    Secondary: They have less quality as the original
    Terciary: break down into chemicals and fuel
    2 methods: pyrolysis, without contact with the fire-> gases and smoke ==> very complex processes -> tar, fuel (petrol / gasoline) and raw materials -> Plastics
    Gasification= Pyrolysis but more temperature and pressure.
    Gas obtained-> produces electricity, methanol or ammonia
    Cuaternary:incineration-> heat-> steam generators, for drying furnaces
    Disadvantages: Very pollutant and expensive

    Plastics manufacturing
    Injection: grains melted / Founded, heating, plunger, screw
    Extrusion: The process of molding plastics for making profiles or tubing
    Blowing: Bottles
    Compression: Thermoset
    Plastics manufacturing

    Injection: grains melted / Founded, heating, plunger, screw

    Extrusion: The process of molding plastics for making profiles or tubing

    Blowing: Bottles

    Compression: Thermosets

    How to cut plastics
    Expanded polystyrene: heated metal thread
    rigid plastics: saw, scratch , breaks off
    Sheets of plastic: scissors
    Rigid Plastics Drilling: slowly, to prevent breakage and chips jumping// flying

    Me gusta

  2. Exercises of electricity

    What voltages and intensities of output will be obtained from a transformer with 50 turns in the primary. The input voltage is 20 volts. In the secondary there are 2 coils with 50 and 300 turns. R=5 ohms
    *****************************************************************************
    Calculate the power that is used by a heater connected to 220 V if it has a resistance of 60 O.
    *****************************************************************************
    Find the intensity which/that circulate in a device which consumes 440w if the voltage it receives is 220v
    ******************************************************************************
    In our home we have a computer which is powered at 250 W and a lamp powered at 100 watts.How much will we have to pay the electrical company each month if the computer is used an average of 2h/day and the lamp 4h/day. Price= 0.1€ Kw.h
    *******************************************************************************
    What ouput voltages and intensities will be obtained from a transformer with 100 turns in the primary, the input voltage is 20 volts. In the secondary there are 2 coils with 50 and 300 turns respectively? R=5O
    *******************************************************************************
    Calculate the power consumed by a heater connected at 220 V if it has a resistance of 30 O
    *******************************************************************************
    Calculate the intensity circulating in a device which consumes 200 W if the input voltage is 220 V

    If you want to practice more:
    http://www.petervaldivia.com/electricity-exercises/
    https://tecnogomezmoreno.wikispaces.com/file/view/1EBil+-+Electricity+-+More+activities.pdf

    Me gusta

Responder

Introduce tus datos o haz clic en un icono para iniciar sesión:

Logo de WordPress.com

Estás comentando usando tu cuenta de WordPress.com. Cerrar sesión / Cambiar )

Imagen de Twitter

Estás comentando usando tu cuenta de Twitter. Cerrar sesión / Cambiar )

Foto de Facebook

Estás comentando usando tu cuenta de Facebook. Cerrar sesión / Cambiar )

Google+ photo

Estás comentando usando tu cuenta de Google+. Cerrar sesión / Cambiar )

Conectando a %s