Goal: To analyze parallel and series circuits. Getting Ready: Using your computer, tablet or phone and navigate to: httpnlf goo.gUM4 Ewrnh Use the provided link to open the Circuit Builder simulator. Once opened, select the pencil icon and use the tools (at the bottom of the screen} to build a circuit. Simply select a bulb, resistor, wire or anuneter (the rectangular box) and tap or click in the workspace where you wish it to be located. You'll get the hang of it quite quickly. Electric potential values are listed in the workspace at the corner of every square on the grid. Current values are listed on the ammeters. Build, Measure, Analyze: Amps Volts 9 V Amps V = Volts Volts 1. Use colored markers (RDYGB) to color code the wires on the diagram above. Use Red for the highest potential and Blue for the lowest potential. 2. How does the current in each individual light bulb compare to each other? 3. Calculate the difference in electric pressure {EN} across each light bulb. Bulb 1: {iv = Volts Bulb 2: NA." = volts Bulb 3: NA." = Volts 4. How do the 5V values across each individual light bulb compare to each other? 5. How do the 5V values across each individual bulb compare to the voltage of the battery? Write an equation for this. From The Physics Classroom's Physics Interactive http://www.physicsclassroom.com Circuit Builder - Voltage Drops Goal: To analyze circuits in order to discover some patterns regarding voltage drops. Getting Ready: Open your browser and go to: http://www.physicsclassroom.com/Physics-Interactives/Electric-Circuits/Circuit-Builder Build, Measure, Analyze: Use the tools (at the bottom of the screen) to build the circuit below. You need a battery, two bulbs, and two ammeters. Position them as shown. To build a circuit, click on a bulb, resistor, wire or ammeter (the rectangular box) and click in the workspace where you wish it to be located. When the circuit has been completed, charges should flow and the bulbs should light. Circuit 1 1 . Use red, blue, and yellow markers to color the three wires in the diagram according to their electric pressure. We will refer to locations around the circuit using their designated colors. Battery 2. Set the voltage of the battery to 12 Volts. (Tap the Modify icon. Then tap on the battery and use the arrows to increase/decrease the voltage to 12 V.) 3. Set the resistance of Bulb 1 to 3 Q and the resistance of Bulb 2 to 3 0. (Tap the Modify icon. Then tap on a bulb and use the arrows to increase/decrease the resistance values.) 4. Electric pressure (i.e., voltage) values for each wire are listed inside circles on the wire. Record the electric pressure values for the red, blue, and yellow wires. Vred = Volts Vyellow = Volts Vblue = Volts 5. Observe that there is a difference in color (i.e., electric pressure) on opposite sides of Bulb 1. The same is true for Bulb 2. We refer to this as a voltage drop since the values of voltage undergo a downward change (drop) as charge passes through the bulbs. Use the values in Q#4 to calculate the voltage drops (AV) for the two bulbs. AVBulb 1 = Volts AVBulb 2 = Volts 6. The current values are listed inside the ammeter boxes for each wire. Observe that the current is the same in each wire. The current is A. 7. Use the current (Q#6) and the resistance (Q#3) values to calculate the I-R product for the two bulbs I.RBulb 1 = I.RBulb 2 = 8. How does the AVBulb 1 of Q#5 compare to the I-RBulb 1 value of Q#7? How does the AVBulb 2 of Q#5 compare to the I-RBulb 2 value of Q#7