Title: UNIT 2 ELECTRIC CIRCUITS
Course: 2024 Physics 3

Unit 2 revisits the behavior of charged particles, discussed in Unit 1, to deepen students’ understanding of the law of conservation of energy and how it’s applied to electric circuits. This unit will ask students to do more than calculate for the current, resistance, and voltage in a simple circuit; it will challenge them to draw connections between the interactions of systems and the changes that result from those interactions. For example, students will need to be able to articulate the impact of a light bulb being removed on a circuit consisting of several light bulbs. They will also need to design an experiment to test if a light bulb is ohmic or justify how changing the spacing of a capacitor will affect its capacitance. Using models and representations to analyze physical situations, as well as using mathematical relationships to justify claims, are critically important science practices in this unit. Unit 2 will also compel students to discover and understand the relationship between the conservation of total energy and the conservation of total electric charge in circuits.

Topics 2.1 Resistivity and Resistance. 2.2 Kirchhoff’s Loop Rule

Session (September 2 - 6) | Before | During | After
Session 1 | Read about resistivity and resistance https://youtu.be/qBo0wfpXBd8?si=avgw2kLtwNwpT7Dy | Explain resistivity and resistance. Individual activity: Measure resistance in different materials. | Solve WebAssign on Resistivity and Resistance https://www.webassign.net/
Session 2 | Review notes on resistivity and resistance | Group activity: Conduct an experiment to compare resistivity in different wires. | Complete lab report and worksheet
Session 3 | Watch a video on resistors in series and parallel https://youtu.be/VV6tZ3Aqfuc?si=rzU2iQBb76gsm3Wl | Explain resistors in series and parallel. Individual activity: Build simple series and parallel circuits. | Solve WebAssign on Resistors in Circuits https://www.webassign.net/
Session 4 | Review notes on series and parallel circuits | Group activity: Analyze the behavior of circuits with resistors in series and parallel. |

Session (September 9 – 13) | Before | During | After
Session 1 | Read about Kirchhoff’s Loop Rule https://youtu.be/JbJ6aGYa63k?si=7b7SlyL0hK1aw8Ch | Explain Kirchhoff’s Loop Rule. Individual activity: Solve simple loop rule problems. | Solve WebAssign on Kirchhoff’s Loop Rule https://www.webassign.net/
Session 2 | Review notes on Kirchhoff’s Loop Rule | Group activity: Apply Kirchhoff’s Loop Rule to complex circuits. | Complete worksheet on loop rule
Session 3 | Read about Ohm's Law and ohmic vs. non-ohmic devices https://youtu.be/HsLLq6Rm5tU?si=YbnTHOf70g_s5SWN | Explain Ohm's Law. Individual activity: Experiment to determine if a light bulb is ohmic. | Solve WebAssign on Ohm’s Law https://www.webassign.net/
Session 4 | Review notes on Ohm's Law | Group activity: Design an experiment to test the ohmic behavior of various devices. |