JJ Thompson Date of Birth/Death: December 18, 1856/August 30, 1940 Nationality: British Scientific theory: He thought there were particles which were smaller than atoms which he was correct about because he discovered electrons. Diagram: Fun Fact: He was called Sir Thompson because he got knighted by the Queen for his excellent work with science. Ernest Rutherford Date of Birth/Death: August 20, 1871/October 19, 1937 Nationality: He is from New Zealand Scientific Theory: His theory was how negatively charged atoms have a positive nucleus. Diagram: Fun Fact: Two of his brothers drowned in 1886 Josh Dalton Date of Birth/Death: September 6, 1766/July 27, 1844 Nationality: British Scientific Theory: He proposed all matter in the universe is made of atoms. Diagram: Fun Fact: He was born being blind and later on people started calling colour-blindness as daltonism. Niels Bohr Date of Birth/Date: October 7,1885/November 18,1962 Nationality: Danish Scientific Theory: Discovered electrons travel in separate orbits around the nucleus while the stay at the surface of an atom. Diagram: Fun Fact:
Was awarded a nobel prize for physics in 1922.
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GROUP: Aaren and Shubhi Today in class we got a worksheet which would help us develop a better understanding of a series circuit and a parallel circuit, and how they work. These are a series of questions answered by me. Have a good day! PART 1 What can you conclude about what happens to the brightness of the bulbs as you add more bulbs in series? Why do you think this is the case? The more bulbs you add, the more the brightness of the bulbs will decrease due to the battery giving every lode the same amount of energy. If the battery only has 9 volts to start with, it will only be able to distribute that 9. - The sum of the voltages lost on the loads equals the total voltage supplied by the battery As you can see, if you add the two lodes volts together you will be able to get the sum of the batteries volts. - Current measured anywhere in the series circuit will be the same PART 2 What can you conclude about what happens to the brightness of the bulbs as you add more bulbs in parallel? Why do you think this is the case? The brightness remains the same because due to the bulbs being parallel to each other, they get the same amount of volts sent to each other. Prove the following statements using a voltmeter/ ammeter/ resistance measurement in the simulation. Use a screen shots to show your work. - Multiple Pathways For Current To Flow, Adding More Pathways Lowers Resistance. One Pathway - Ω = 9V ÷ 0.9A = 10Ω Two Pathways - Ω = 9V ÷ 1.80A = 5Ω Three Pathways - Ω = 9V ÷ 2.70A = 3.33Ω - Voltage remains the same through each pathway of the parallel circuit In these you can see how the volts stay the same throughout the entire circuit. - Current splits up between the different current pathways In different parts of the circuit, the current is different. CONCLUSION QUESTIONS 1. How does the parallel circuit compare to the series circuit? Series Circuit: Bulbs are dimmer as you add more, current is the same, and voltage is different. Parallel Circuit: Bulbs shine the same brightness, current is different, voltage is the same. 2. What happens when you break a parallel circuit (try it out in the sim if you need to!)? How would this property be useful when designing circuits? If you break a parallel circuit the circuit will still work but only that one bulb that broke is out. This is useful with Christmas lights because before when one light went out, all of them went out, but with parallel circuit, if one goes out all the other ones are still alive. 3. What are the advantages and disadvantages of series and parallel circuits? Series Advantages: - When you add more batteries the light bulb gets brighter. Parallel Advantages: - If a lode breaks, the rest will still work - All the light bulbs have the same brightness at all times. Series Disadvantages: - The light bulbs get less bright when you add more bulbs to the circuit. - The circuit will not work if one part of it goes out. Parallel Disadvantages: - Fires can happen if there are too many batteries. |
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May 2016
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