Go to the simulation at https://phet.colorado.edu/en/simulation/circuit-construc

Question

Go to the simulation at https://phet.colorado.edu/en/simulation/circuit-construction-kit-ac or http://phet.colorado.edu/sims/circuit-construction-kit/circuit-construction-kit-ac_en.jnlp

Go to the simulation at http://phet.colorado.edu/en/simulation/circuit-construction-kit-ac or http://phet colorado.edu/sims/circuit-construction-kit/circuit-construction-kit-ac en jnlp. On a Windows machine, you will probably need to click "Download" and then "Open". [If this will not run on your computer, please try another browser or computer. It should work on campus lab computers and the computers in the PARC in Osmond 215.1 Create the circuit shown below. [If the image is not appearing on your computer, it's posted on Angel. There is a resistor, a light bulb, one capacitor, one battery, and two switches. Control-click on the battery and change its voltage to 25 V (its default is 9 V). Control-click on the capacitor and change its C to 0.05 F. (a) With the top switch open, close the bottom switch. What happens to the charge on the capacitor & the brightness of the bulb as a function of time? The charge starts large and decreases to zero over time; the bulb starts bright and dims over time. The charge and the brightness start at zero and continue to increase over time never reaching a maximum value The charge starts at zero and increases to some maximum value; the bulb starts bright and dims over time. The charge starts large and decreases to zero over time; the bulb starts dim and brightens, reaching a maximum brightness The charge starts at zero and increases to a maximum value; the bulb starts dim and brightens, reaching a maximum brightness (b) Now open the bottom switch and close the top one. What happens to the charge on the capacitor and the brightness of the bulb as a function of time? The charge and brightness both increase from zero over time The charge increases over time while the brightness of the bulb decreases over time The charge and brightness both decrease to zero over time. The charge decreases over time while the brightness of the bulb increases over time.

Explanation / Answer

A) first the capacitor gets charged and then charges stops to flows to bulb since the capacitor gains a voltage equal to the battery. The charge starts at 0 and increases to a max value. the bulb starts bright and dims over time

B)the charge and brightness both reduce to zero over time

C)the bulb lights only when the capacitor begins charging or discharging

D) time scale = RC . resistance R calculated from color code = 100 ohms. C=0.05 . therefore, t = 5 seconds

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