Lesson Plan

• Recall the definition of electrical resistance and its unit (ohm).
• Apply Ohm’s law to calculate resistance, voltage, or current from given values.
• Analyze how material, length, cross‑sectional area, and temperature influence resistance.
• Use the resistivity formula R = ρ L⁄A to determine the resistance of a conductor.

• Projector or interactive whiteboard
• Slide deck with circuit diagram and formulas
• Worksheets with practice problems
• Multimeter or virtual circuit simulation (e.g., PhET)
• Rulers and calculators
• Whiteboard and markers

Begin with a quick demonstration of a simple circuit where a bulb dims when a resistor is added, prompting students to consider why. Review the concepts of voltage and current from the previous lesson, linking them to the new focus on resistance. Explain that by the end of the session they will be able to calculate resistance using R = V⁄I and predict how material properties influence it.

1. Do‑now (5’) – Solve a short problem calculating resistance from given V and I on a worksheet.
2. Mini‑lecture (10’) – Define resistance, present R = V⁄I, Ohm’s law, and factors affecting resistance with slides.
3. Guided practice (12’) – Work through the resistivity example together, using R = ρ L⁄A.
4. Interactive simulation (8’) – Students use a virtual circuit to change material, length, and area and observe resistance changes.
5. Independent practice (10’) – Worksheet with mixed problems (calculate unknown V, I, or R) and a common‑mistake checklist.
6. Check for understanding (5’) – Exit ticket: one sentence explaining when R = V⁄I is applicable.

Elicit a brief recap of the key relationships and how resistance depends on material properties. Have students complete an exit ticket answering a real‑world scenario involving resistance calculation. Assign homework: a set of resistance problems, including a resistivity calculation, to reinforce the lesson.