Sumário
- Preface
1What is Physics?
10Special Relativity
16Mirrors and Lenses
17Diffraction and Interference
23Particle Physics
- AReference Tables
- Index
Performance Task
Performance Task
29.
- An incandescent light bulb (i.e., an old-fashioned light bulb with a little wire in it)
- A lightbulb socket to hold the light bulb
- A variable voltage source
- An ammeter
Procedure
- Screw the lightbulb into its socket. Connect the positive terminal of the voltage source to the input of the ammeter. Connect the output of the ammeter to one connection of the socket. Connect the other connection of the socket to the negative terminal of the voltage source. Ensure that the voltage source is set to supply DC voltage and that the ammeter is set to measure DC amperes. The desired circuit is shown below.
- On a piece of paper, make a two-column table with 10 rows. Label the left column volts and the right column current. Adjust the voltage source so that it supplies from between 1 and 10 volts DC. For each voltage, write the voltage in the volts column and the corresponding amperage measured by the ammeter in the current column. Make a plot of volts versus current, that is, a plot with volts on the vertical axis and current on the horizontal axis. Use this data and the plot to answer the following questions:
- What is the resistance of the lightbulb?
- What is the range of possible error in your result for the resistance?
- In a single word, how would you describe the curve formed by the data points?