1202_LabManual.pdf

# Camera and notice that the flash works by slowly

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camera and notice that the flash works by slowly charging a capacitor with a battery and then quickly releasing the stored energy through a light bulb when a photo is taken. You think that the problem with your camera may be that not enough energy is stored in the capacitor to properly light the flash bulb. You have another capacitor, of different capacitance, but aren’t sure if you should connect it in series or in parallel with the original capacitor in order to store the most energy. First you calculate which of the two ways of connecting the two capacitors results in the most stored energy. Next you decide to test your calculation by seeing which circuit takes longest to charge through a bulb. You reason that more energy stored will result in a longer charge time. Which circuit consisting of a bulb, a battery, and two capacitors takes the longest time for the bulb to dim? Read Sternheim & Kane sections 16.4, 16.9, 17.7 and 18.4. E QUIPMENT Build the circuits shown below out of wires, identical bulbs, two different capacitors, and batteries. Use the accompanying legend to help you build the circuit. You will also have a stopwatch. Note: Check to make sure the light bulbs are all of the same type. To find identical bulbs look for markings on the base and check to see that the color of the bead separating the filament wires is the same. If you need assistance, send an email to [email protected] . Include the room number and brief description of the problem. W ARM UP 1. Draw a picture of each arrangement of the capacitors, light bulb, and battery. On each picture, label the capacitance of each capacitor, remembering that you only 83

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