🔋 Part 1: Energy Concepts

1. According to the law of conservation of energy, what happens to the total amount of energy in a closed system?

It increases over time

It remains constant

It decreases over time

It changes randomly

2. In your circuit investigation, what forms of energy did you observe? (Select all that apply)

Electrical energy

Light energy

Heat energy

Sound energy

3. Which statement best describes energy efficiency?

The amount of energy created by a system

The ratio of useful energy output to total energy input

The speed at which energy transfers occur

The total energy stored in a battery

4. Complete the efficiency formula:

Efficiency = _________________ ÷ _________________ × 100%

🔬 Part 2: Investigation Analysis

5. Record your experimental data:

Battery voltage: _______ V

Current reading: _______ A

Temperature increase: _______ °C

Light intensity (bright/dim/very dim): _________________

6. Calculate the efficiency of your circuit. Show your working:

7. Explain what happened to the "lost" energy in your circuit:

8. How did adding resistance affect the energy outputs in your circuit?

📊 Part 3: Sankey Diagram & Real-World Applications

9. Draw a Sankey diagram for your circuit investigation. Label the energy input and all energy outputs:

10. Give two examples of energy-efficient devices or systems you use at home:

1. _________________________________________________

2. _________________________________________________

11. Explain why improving energy efficiency is important for both the environment and the economy:

12. Reflection: Identify one energy transformation in your home and discuss how efficient you think it is and why:

Energy Efficiency Investigation

Energy Efficiency Investigation

🔋 Part 1: Energy Concepts

🔬 Part 2: Investigation Analysis

📊 Part 3: Sankey Diagram & Real-World Applications

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