Let's solve each of the
energy transfer diagrams step by step. The goal is to identify the
initial energy source, the
energy transformation, and the
final forms of energy (often including useful energy and wasted energy).
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🔹 1. Flashlight
Image: A flashlight turned on, emitting light.
Energy Transfer:
- The flashlight uses
chemical energy stored in its batteries.
- This chemical energy is converted into
electrical energy when the circuit is completed.
- The electrical energy is then transformed into
light energy (useful) and
heat energy (wasted).
✔ Answer:
```
Chemical Energy → Light Energy + Heat Energy
```
>
✔ Explanation:
> Batteries store chemical energy. When the switch is turned on, this energy is converted into electricity, which powers the bulb. The bulb emits light (useful) but also gets warm (heat), which is wasted energy.
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🔹 2. Boy Eating Food → Running
Image: A boy eating food, then running.
Energy Transfer:
- The food contains
chemical energy (from nutrients like carbohydrates).
- The body digests the food and converts that chemical energy into
kinetic energy (movement) and
heat energy (body warmth, metabolic heat).
✔ Answer:
```
Chemical Energy → Kinetic Energy + Heat Energy
```
>
✔ Explanation:
> Food provides stored chemical energy. During digestion and metabolism, this energy is released and used for movement (kinetic energy). Some energy is lost as heat due to metabolic processes.
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🔹 3. Burning Candle
Image: A lit candle with a flame.
Energy Transfer:
- The wax in the candle stores
chemical energy.
- When burned, it undergoes combustion, converting chemical energy into
light energy (the flame) and
heat energy (warmth from the flame).
✔ Answer:
```
Chemical Energy → Light Energy + Heat Energy
```
>
✔ Explanation:
> The candle’s wax is a fuel that releases energy when burned. The flame produces visible light and warmth. Both are outputs, but light is often considered useful, while heat is often waste depending on context.
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✔ Final Answers:
1.
Chemical Energy → Light Energy + Heat Energy
2.
Chemical Energy → Kinetic Energy + Heat Energy
3.
Chemical Energy → Light Energy + Heat Energy
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These diagrams show how energy is transferred and transformed in everyday situations, always following the law of conservation of energy — energy is never destroyed, just changed in form.
Parent Tip: Review the logic above to help your child master the concept of energy transfer worksheet.
