Lesson Plan

• Recall that potential difference is defined by V = W / Q and state its units.
• Explain how voltage, current and power are related (P = V I) and derive the equivalent forms.
• Apply V = W / Q and P = V I to solve numerical problems involving energy, charge, time and power.
• Identify common misconceptions about voltage and power units and correct them.

• Projector and screen
• Whiteboard and markers
• Printed worksheet with practice problems
• Scientific calculators
• Simple circuit kit (battery, resistor, ammeter, voltmeter)
• Handout of the circuit diagram
• Student notebooks

Begin with a quick discussion of everyday appliances (e.g., a heater) to highlight why voltage and power matter. Review prior knowledge of current (I) and energy (W) and ask students to predict how these relate to voltage. State that by the end of the lesson they will be able to calculate voltage from work and charge and use it together with current to find power.

1. Do‑now (5'): short quiz on definitions of V, I, P and their units.
2. Mini‑lecture (10'): derive V = W / Q, introduce the unit table, and show how P = V I follows from the definitions.
3. Guided example (8'): work through the heater problem step‑by‑step, emphasising substitution and unit checks.
4. Hands‑on demonstration (12'): set up the simple circuit, measure V and I, calculate P, and discuss the results.
5. Collaborative worksheet (10'): students solve a set of problems mixing voltage, charge, energy and power; teacher circulates to provide feedback.
6. Check for understanding (5'): exit‑ticket question – “A device uses 500 J of energy in 25 s. What is its voltage if the charge moved is 10 C?”

Summarise the key formulas V = W / Q and P = V I, stressing correct units and the link between energy, charge and time. Collect exit tickets and review common errors. Assign homework: a worksheet with mixed numerical questions requiring use of the three power‑voltage‑current forms.