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Name: ______________________________ Home 2-2: Lighten Up qWDYT? p. 50 (this sheet) qFYTD (this sheet) qFor You To Read, p. 52 qPTG p. 54 #1-2 (on loose leaf or on back) WDYT? ______________________________________________________________________________________________ ______________________________________________________________________________________________ ______________________________________________________________________________________________ FYTD You and your partner will use the simulation at the website listed below to answer the questions below. After constructing the circuits in questions 1, 3, and 5, be sure to have your teacher confirm that the circuit is built correctly. Simulation Website: (after accessing the website, click on “Run Now!”) http://phet.colorado.edu/simulations/sims.php?sim=Circuit_Construction_Kit_DC_Only 1. Build a basic circuit with a battery, two wires, and a light bulb. _______ a. By right clicking on the battery you can increase its voltage. Increase the voltage of the battery to 25 V, what happens to the brightness of the bulb? __________________________________ _____________________________________________________________________________ _____________________________________________________________________________ b. The brightness of a light bulb depends on how much current is running through the bulb. Increasing the amount of current will increase the brightness. Using this fact and your results from part a, what relationship exists between voltage and current in a light bulb? _____________________________________________________________________________ _____________________________________________________________________________ c. By right clicking on the light bulb you can increase its resistance. Increase the resistance of the Light bulb to 25 W, what happens to the brightness of the bulb? _________________________ _____________________________________________________________________________ _____________________________________________________________________________ d. Using your results from part c, what relationship exists between resistance and current? _____________________________________________________________________________ _____________________________________________________________________________ 2. Using pg. 51 of your textbook as a guide, draw a circuit with two light bulbs connected to a battery in series. 3. Reset the resistance in the light bulb to 10 W. By right clicking on the connection point between the wire and the battery, you can disconnect the wire from the light bulb. Add another light bulb in series with the original one. _______ a. What happen to the original light bulb when the wire was disconnected? __________________ _____________________________________________________________________________ _____________________________________________________________________________ b. What happened to the brightness of the bulbs when the second bulb was added in series _____________________________________________________________________________ _____________________________________________________________________________ c. According to your results from part b, does the current in the light bulbs increase, decrease, or stay the same when a second bulb is added in series? __________________________________ _____________________________________________________________________________ _____________________________________________________________________________ d. After the light bulbs are connected in series, disconnect one of the light bulbs. What happens to the other light bulb? ____________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ 4. Using pg. 51 of your textbook as a guide, draw a circuit diagram with two light bulbs connected to a battery in parallel. 5. Build a new circuit with two light bulbs connected in parallel to a battery. Set the voltage of the battery to 25 V. _______ a. What happened to the brightness of the bulbs when the second bulb was added in parallel? _____________________________________________________________________________ _____________________________________________________________________________ b. According to your results from part a, does the current in the light bulbs increase, decrease, or stay the same when a second bulb is added in parallel? _________________________________ _____________________________________________________________________________ _____________________________________________________________________________ c. After the light bulbs are connected in parallel, disconnect one of the light bulbs. What happens to the other light bulb? __________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ d. Increase the voltage of the battery to 40 V and add another light bulb in parallel to the original two. What happens to the circuit? _________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ 6. What are the advantages and disadvantages of a series circuit? __________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 7. What are the advantages and disadvantages of a parallel circuit? ________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________