Fundamentals of Circuits I: Current Models, Batteries & Bulbs

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Fundamentals of Circuits I: Current Models, Batteries & Bulbs v 0.1 • one wire (6 inches or more in length) Step 1: Use the materials listed above to find some arrangements in which the bulb lights and some in which it does not light. For instance, try the arrangement shown below. Figure 3: A wiring configuration that might make a bulb light with a battery. Question 1.5 Sketch below two different arrangements in which the bulb lights. (Note: there are a total of four including the one pictured above). Question 1.6 Sketch below two arrangements in which the bulb doesn’t light. Question 1.7 Describe as fully as possible what conditions are needed if the bulb is to light, and why the bulb fails to light in the arrangements drawn in answer to Question 1.6. Activity 1.3: Other Materials Between the Battery and Bulb In the previous activity you found that a wire, properly connected to a battery and a bulb, allows current to flow. By definition we refer to materials that allow current flow as conductors. By contrast materials which do not allow current flow are called nonconductors. PHYS-204: Physics II Laboratory 5
Fundamentals of Circuits I: Current Models, Batteries & Bulbs v 0.1 Lets examine some common materials to see which are conductors and which are nonconductors. We can do that by determining which materials allow the bulb to light. You will need • common objects: paper clips, pencils, coins, rubber bands, fingers, paper, keys etc. Connect a single wire, the battery, and a bulb so that the bulb lights. Choose one of the arrangements drawn in your answer to Question 1.5. Then, with the help of your partner, stick in a variety of the common objects available between the battery and the bulb. Question 1.8 List the materials that allow the bulb to light. Question 1.9 List the materials that prevent the bulb from lighting. Question 1.10 What types of materials seem to be conductors What types seem to be non-conductors By now you will have discovered that it is difficult to hold your circuits together From here on, you can make it easier by using a battery holder and a bulb socket. These things, with the addition of a switch are found on the circuit board provided. Activity 1.4: Using a Battery Holder, Bulb Socket and Switch For this activity, in addition to the materials you’ve already used, you will need: • battery holder (for a D cell) • several wires (6 inches or more in length) • flashlight bulb socket • contact switch Step 1: Examine the bulb socket carefully. Examine what happens when you unscrew the bulb. Note which parts of the bulb make contact with which parts of the socket. Step 2: Examine the bulb closely. PHYS-204: Physics II Laboratory 6
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Fundamentals of Circuits I: Current Models, Batteries & Bulbs

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