Real-world Energy Transformations Examples Grade 7

📚 Quick Study Guide

• ☀️ Energy Transformation Definition: 🔄 Energy transformation is the process of energy changing from one form to another. Energy cannot be created or destroyed, but it can change form. This is the Law of Conservation of Energy.
• 🔥 Common Forms of Energy: ✨ There are many forms of energy, including: Kinetic (motion), Potential (stored), Thermal (heat), Electrical, Chemical, Radiant (light), and Nuclear.
• 🚗 Example 1: Car Engine: ⛽️ Chemical energy (from gasoline) $\rightarrow$ Thermal energy (combustion) $\rightarrow$ Mechanical energy (motion of the car).
• 🔦 Example 2: Light Bulb: 💡 Electrical energy $\rightarrow$ Radiant energy (light) + Thermal energy (heat).
• 🪴 Example 3: Photosynthesis: 🌱 Radiant energy (sunlight) $\rightarrow$ Chemical energy (glucose in plants). The formula for photosynthesis is: $6CO_2 + 6H_2O + Light \rightarrow C_6H_{12}O_6 + 6O_2$.
• 💪 Example 4: Human Body: 🍎 Chemical energy (from food) $\rightarrow$ Kinetic energy (movement) + Thermal energy (body heat).
• 🔋 Example 5: Battery: ⚡ Chemical energy $\rightarrow$ Electrical energy.

🧪 Practice Quiz

1. Which of the following best describes energy transformation?
   1. A. Creating energy from nothing.
   2. B. Destroying energy by using it.
   3. C. Changing energy from one form to another.
   4. D. Keeping energy in the same form.
2. In a car engine, what energy transformation primarily occurs?
   1. A. Electrical to Chemical
   2. B. Chemical to Mechanical
   3. C. Radiant to Thermal
   4. D. Nuclear to Electrical
3. What energy transformation happens in a light bulb?
   1. A. Chemical to Radiant
   2. B. Mechanical to Electrical
   3. C. Electrical to Radiant and Thermal
   4. D. Thermal to Electrical
4. Which energy transformation is most important for plants during photosynthesis?
   1. A. Chemical to Kinetic
   2. B. Radiant to Chemical
   3. C. Electrical to Chemical
   4. D. Thermal to Radiant
5. When a person eats food and then goes for a run, what is the primary energy transformation?
   1. A. Radiant to Kinetic
   2. B. Chemical to Kinetic and Thermal
   3. C. Electrical to Radiant
   4. D. Thermal to Chemical
6. What type of energy transformation occurs within a battery?
   1. A. Electrical to Chemical
   2. B. Chemical to Electrical
   3. C. Mechanical to Electrical
   4. D. Radiant to Electrical
7. A solar panel converts sunlight into electricity. What type of energy transformation is this?
   1. A. Chemical to Electrical
   2. B. Radiant to Electrical
   3. C. Thermal to Electrical
   4. D. Mechanical to Electrical