Lesson Plan

• Describe the concept of series connection and its effect on current flow.
• Apply the series resistance formula to calculate equivalent resistance for any number of resistors.
• Analyse circuit diagrams to identify series groups and avoid common errors.
• Solve quantitative problems involving series circuits, including calculating current using Ohm’s law.

• Whiteboard and markers
• Projector or interactive display
• Printed worksheets with practice tables
• Set of resistors and a battery for a quick demo
• Calculator (or smartphone)
• Rulers and diagram handouts

Begin with a quick demonstration of a string of light bulbs lighting up when connected end‑to‑end, asking students what they notice about the current. Recall that current is the same through components in series and review the formula for resistance. Explain that by the end of the lesson they will be able to calculate the combined resistance of any series network and check their work against a target answer.

1. Do‑now (5'): Students complete a short worksheet identifying series vs. parallel in given diagrams.
2. Mini‑lecture (10'): Review key concepts and derive the series resistance formula, using the board.
3. Guided practice (12'): Work through the provided worked example together, prompting students to write each step.
4. Independent practice (15'): Students solve the practice table sets and the three practice questions while the teacher circulates for support.
5. Check for understanding (8'): Quick quiz or exit ticket where each student writes the equivalent resistance for a new set of resistors.

Summarise that series resistors add directly because the same current flows through each, and highlight the common mistakes to avoid. Ask a few students to share their answers from the exit ticket to reinforce the concept. Assign homework: complete a worksheet with five additional series‑circuit problems, including one that requires calculating current using the total resistance.