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Product: Inquiry Lab Template Two labs that are nicely paired that allow students to develop the laws that govern series and parallel circuits Grade Level/Subject Physics Unit Circuits Enduring Understanding Charge exists everywhere in a circuit. A power supply gives these charges energy, which may then be converted to other forms of energy SOL Objectives PH.11 The student will investigate and understand how to diagram, construct, and analyze basic electrical circuits and explain the function of various circuit components. Key concepts include a) Ohm’s law; b) series, parallel, and combined circuits; c) electrical power; and alternating and direct currents. Series and Parallel Circuits Title Lesson Objective Determine the mathematical relationships that exist in parallel and series circuits Inquiry Level 2 Materials Required Circuit building supplies (wires, multiple resistors, at least 1 voltmeter and ammeter per group) Note: Although multiple meters are shown, students are verbally directed before the lab to move the meter from location to location Note: Be sure the wires that you use have small enough resistance so that the parallel circuit shows the proper relationship. Skinny wires often cause enough loss that the relationship is lost, Series circuits Part A a) Build the following circuits and observe the brightness of the light bulb in each case. All light bulbs should be the ROUND light bulbs. Circuit 1: Circuit 2: R1 Circuit 3: R2 R3 R4 R5 R6 Questions: 1. How does the brightness of R2 compare with R1? 2. How does the brightness of R2 compare with R3? 3. How does the brightness of R5 compare with R3? 4. How does the brightness of R6 compare with R4? 5. Based on your observations, how does the amount of current flowing in a circuit change as light bulbs are added? Explain your thoughts. 6. Based on your observations, compare the amount of current flowing through R4 compare with R5 and R6? Explain your thoughts. Part 2: Abatt Set up the following circuit. Record the resistor sizes in the chart below. For each circuit, measure the current at each of the marked locations. Record the data in the table below. A1 A2 A3 Part 3: V1 Change the meters but keep the resistors the same. For each circuit, measure the voltage at each of the marked locations. Record the data in the table below Vbatt V2 V3 Battery R1= R2= R3= Current Voltage Questions: 1. What general trends can you see/observe about current in a series circuit? 2. What general trends do you see/observe about voltage in a series circuit? Parallel circuits Part A b) Build the following circuits and observe the brightness of the light bulb in each case. All light bulbs should be the ROUND light bulbs. Circuit 1: Circuit 2: R1 Circuit 3: R2 R4 R3 Questions: 7. How does the brightness of R2 compare with R1? 8. How does the brightness of R2 compare with R3? 9. How does the brightness of R5 compare with R3? 10. How does the brightness of R6 compare with R4? R5 R6 Abatt Part 2: Set up the following circuit. Record the resistor sizes in the chart below. For each circuit, measure the current at each of the marked locations. Record the data in the table below. A2 A1 R2 R1 Part 3: Change the meters but keep the resistors the same. For each circuit, measure the voltage at each of the marked locations. Record the data in the table below Vbat R2 V1 Battery R1= R1 R2= Current Voltage Questions: 3. What general trends can you see/observe about current in a parallel circuit? 4. What general trends do you see/observe about voltage in a parallel circuit? V2