Wednesday, 27 May 2015

First Day


  • What did you do today? 
    • Briefly describe your day’s activities
      • We had to use a generator to generate electricity through a motor that is connected to a wheel of a bicycle. So, when a person on the bicycle pedals, the wheel turns the motor and the generator produces electricity. First, we plugged a generator to a light bulb. Then we realised the bulb was not working and we used a tachometer to measure the current from the generator. We also used a speedometer to measure the speed of the wheel, getting some readings from it as well. Then we tried to use a better generator to charge a car battery. When we connected the car battery to the generator and started pedalling, there was burning somewhere and the student mentors helped us to troubleshoot the electrical components. In the end, it worked and the car battery was charged. After lunch, the three groups rotated projects and my group did the automated waste sorting system project. It is about using physical properties of waste to sort them. These physical properties include magnetism, mass, size and shape of the material. First, cans that are made of magnetic materials like steel and tin will be attracted by a spinning magnet when it enters the system. The magnet will spin the can, making it hit a metal piece and dropping to the ground, where the cans are sorted. The other waste continue on along the system and the glass, the heaviest, will drop through a  metal piece that will only open if the object is heavy enough. The rest of the waste go on and the smaller metal cans will drop into a hole, which the larger plastic bottles cannot fit in. The plastic bottles are then dropped at the end of the system, thus sorting all the waste.
  • What did you learn today? 
    • Discuss any learning points from today’s activities
      • We learnt how electricity can be produced efficiently and causes no environmental pollution.
      • I learnt that physical properties of things can be very useful.
  • How do you feel about today’s activities? 
    • Describe how the project has affected your understanding of the discipline and how it may be applied elsewhere. Share your insights for the day
      • The bicycle electrical generator project taught me that we should not take electricity for granted. Many people in developing countries have no access to electricity.
      • The waste sorting system taught me that we should be mindful about our impact to the environment. 

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