Act11_sol - Period 11 Activity Sheet Solutions Electric...

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41 Period 11 Activity Sheet Solutions: Electric Current Activity 11.1: How Can Electric Charge Do Work? Your instructor will demonstrate a Wimshurst machine, which separates electric charge. a) Describe what happens to the hanging soda cans as electric charge from the Wimshurst machine flows onto the cans. Explain how the separated charge does work on the cans. The attractive electrical force between the positive charge on one can and the negative charge on the other can causes the two soda cans move closer together over a distance of about 5 cm. b) Why do you see sparks between the cans or between the balls of the Wimshurst machine? The attractive electrical force between the cans or between the balls of the Wimshurst machine becomes so great that the separated charge comes back together by moving through the air from one can to the other or from one ball to the other. As the charge moves, some of its electrical energy is converted into thermal, radiant, and sound energy. Activity 11.2: What is an Electric Circuit? a) Lighting a bulb Arrange one battery, one connecting wire, and one small light bulb (not in a tray), so that the bulb lights. You may need to try several different arrangements. 1) Draw a diagram showing your arrangement of the battery, wire and bulb that worked. b) Circuit in a flashlight In part (a), you found how to light a bulb with a battery and one wire. A flashlight uses the same principle. Examine a flashlight to find the path that the current takes. 1) Draw a diagram of the flashlight showing the path the current follows. 2) Explain why this arrangement worked and other arrangements you tried did not work. This arrangement makes a complete circuit from the battery through the bulb and back to the battery. The bulb has connecting pathways through the side and bottom of its base. Arrangements that do not connect the side and bottom of the bulb base do not form a closed circuit and will not light the bulb. 2) If a flashlight does not work, it must have an open circuit. List problems that could cause an open circuit in a flashlight. An open circuit in a flashlight could be caused by: a burned out bulb (the bulb filament is broken), the long copper switch not touching metal at its bottom or at its top, the batteries not touching one another, or dead batteries, which send no charge through the circuit.
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42 c) Plumbing Analogies Your instructor will demonstrate plumbing analogies for circuits. Fill in the electrical concepts represented by the plumbing display. 1)
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Act11_sol - Period 11 Activity Sheet Solutions Electric...

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