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Flashcards

mod p2 living for the future pg 32..

NJW330 Physics English 30 cards

Cards in this deck (30)

  1. 1here we go , give one advantage and disadvantage of using photocells to generate electricity.IT DOES NOT WORK WITHOUT SUNLIGHT
    IT DOES NOT HARM THE ENVIROMENT BY POLLUITION-RENEWABLE-STEARDY-LOW MATINENCE
  2. 2explain how wind turbines convert energy from the sun into electricityTHE SUNS ENERGY IS THE WIND AND IT CONVERTS KINETIC ENGERY OF MOVING AIR (CONVECTION CURRENTS) INTO ELECTRICITY.CONVECTION CURRENTS
  3. 3briefly describe how a power station worksIT HAS FOSSIL FUELS OR NUCLEAR FUELS WHICH ARE HEATED IN THE BOILER, THE STEAM MOVES THE TURBINE, THE TURBINE SPINNS WHICH CREATES POWER WHICH IS TURNED INTO ELECTRICITY IN THE GENERATOR WHICH IS ELECTROMAGNETIC .
  4. 4a kind map i think of different power sources and their advantages and disadvantages .make it pretty.DONE
  5. 5define electromagnetic induction and what factors affect the size of the induced voltage and currentCREATION OF A VOLTAGE AND MAYBE CURRENT IN A WIRE WHICH IS EXPERIENCING A CHANGE IN A MAGNETIC FIELD.
  6. 6Describe how a generator worksROTATE A COIL IN A MAGNETIC FIELD.
  7. 7explain why a very high electrical voltage is used to tansmit electricity in the national gridit is cheaper than a high current less dangerous as high current would be hold and is more efficient
  8. 8write down the formula for calculating the efficiency of power stationsTOTAL ENERGY INPUT=USEFUL ENERGY OUTPUT+NOT USEFUL OUTPUT.
    EFFIENCY=USEFUL ENERGY OUTPUT % TOTAL ENERGY INPUT X 100
  9. 9how many units o f electrictyin KWH would a kettle of power 2500 w use in 3 minutes ......god that sounds really heardenergy=power x time=2.5kw x 0.05 h = 0.125 kwh.
  10. 10now how much would boiling the kettle use. if one unit of electricity costs 12pcost = cost per unit x number of units = 12 x 0.125 = 1.5p.
  11. 11briefly descibe how the greenhouse effect keeps the earth warmthe energy of the sun is absorbed by the earth and is kept in the atmosphere.
  12. 12how has human activity affected weather patternshumans use much more co2 from burning fossil fuels. chopping down trees means more co2-methane is increasing due to cattle
  13. 13name 3 types of radiation and describe their ionising powersalpha are big and heavy-beta are electrons- gamma waves are electromagnetic waves.
  14. 14why are these radiations used-medical tracersthey are used to show where the strongest reading are coming
  15. 15treating cancergamma rays are will kill all living cells. so they can be used to treat cancers but the have to be carefully direct so won't ham good cells
  16. 16smoke detectors?
  17. 17ok give me a little mind map of advantages and disadvantages of nuclear powera,it can make lots of energy without releasing CO2.b)it releases alot more energy than chemical reactions. disadvatage. a) expensive to bulid and maintainb) it takes longer to start up and processes uranian which causes pollution
  18. 18describe the precautions you should use when handling radioactive sources in the lab ( think spiderman)a) wear protective clothing to protect your skin . b)to keep arms length so can't breath in c) keep exposure time short
  19. 19briefly explain why it is difficult to dispose of radio active wastes safelyits high level waste (dangerous)and also needs to be geographically stable as with corrode inefficient materials
  20. 20what shapes are the orbits of the planets in the solar systemthe shapes are ..not stated but look circles
  21. 21what force keeps planets and satellites in their orbitsgravity keeps them in orbit.
  22. 22tell me what the difference is between asteroids and cometsasterolids are peices of rock that float in the suns orb. a comit is a ball of rock dust and ice which orbit the sun in elongated elipse and come from other planets
  23. 23oh my god ..i know this one ..what is a light yeara light year is how scientists measure distance in space=the distance that light travels through vacum in 1 year
  24. 24what would be the problem in sending a group of astronauts to neptuneneptune is a planet very far awayand the ship would have to be full of fuel whih would men heavy and expensive and also due o to the distance astronauts would have muscle wastage and get very old
  25. 25gve 2 advantages and 2 disadvantageous of manned space tarvelsee above.
  26. 26what type of radiation is found everywhere in the universemicrowave radiation
  27. 27in know this one to....describe the big bang theorya)universe was a very small space(smaller than a pin head).b)then it exploded and started to expand c)it is 14 billion years old
  28. 28list the steps that lead to the formation of a main sequence star(like our sun)the star forms from cloulds of dust and gas> the force of gravity brings them together forming a protostar>when temp gets high enough it pulls everything (thermal nucula fusion)inwards and pressure pulls it together making a main sequance star.
  29. 29describe Copernicians model of the universehe was an ancient greek and thought that earth and all the planets were in a stright line and all perfect circles and the sun was the centre of the universe.
  30. 30explain the evidence that Galileo produced that supported Copernicus theory .....( that sounds boring)he noiced that venus had different light phases like ours meaning that the planet was lite by a sun similar to earth

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Physics Flashcards on mod p2 living for the future pg 32.., created by NJW330 on 22/03/2014.
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