pre-lab preparation sheet for lab 4—batteries, bulbs, and current

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Figure 4-16: An analog to electric current and resistance. It is possible to use a two-dimensional mechanical analog to model this picture of current through conductors. You should note that the real flow of electrons is a threedimensional affair. The diagram for the two-dimensional analog is reproduced in Figure 4-16. Extension 3-1: Drawing an Analogy Look at the current and resistance analog in Figure 4-16, or view the movie in experiment file Current and Resistance Analog (L04E3-1) and then answer the following questions. Question E3-1: What part of the picture represents the action of the battery? What represents the electric charge and current? What part represents the collisions of electrons? Explain. Question E3-2: What ultimately happens to the ―energy‖ given to the balls by the ―battery‖? What plays the role of the bulb? How is this energy loss exhibited in the circuit you wired that consists of a battery, two wires, and a bulb? Question E3-3: How does this model help explain the fact that electric current doesn’t decrease as it passes through the bulb? Lab 04 – Batteries and Current
Question E3-4: How does this model help explain the fact that electrons move with a constant average speed υ drift , rather than having a constant acceleration caused by the constant electric field? Question E3-5: In this model what would happen to the ―ball‖ current if the drift velocity doubled? What can you do to the ramp to increase the drift velocity? Lab 04 – Batteries and Current
Page 1 and 2: Name_______________________________
Page 3 and 4: Name_________________________ Date_
Page 5 and 6: The purpose of the first activity i
Page 7 and 8: Question 1-5: Do the charges genera
Page 9 and 10: Question 1-11: What types of materi
Page 11 and 12: You are now ready to explore models
Page 13 and 14: Look at Figure 4-8b and convince yo
Page 15 and 16: 5. Try any other tests you need to
Page 17 and 18: Activity 2-2: Inventing and Constru
Page 19 and 20: Figure 4-12: Two voltage sensors co
Page 21 and 22: 9. Now connect a voltage and a curr
Page 23: Question 2-7: When you added the se
Page 27: 3. Name the circuit element represe

pre-lab preparation sheet for lab 4—batteries, bulbs, and current

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