To solve the problem, we need to identify the energy transformations that occur in each device when electrical energy is input. Let's analyze each device step by step:
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1. Electric Kettle
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Input Energy: Electrical energy
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Output Energy: The electric kettle primarily converts electrical energy into
heat energy to boil water.
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Explanation: When electricity flows through the heating element inside the kettle, it encounters resistance, which generates heat. This heat is then transferred to the water.
Energy Transformation:
Electrical energy → Heat energy
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2. Light Bulb (Lamp)
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Input Energy: Electrical energy
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Output Energy: The light bulb converts electrical energy into
light energy and also produces some
heat energy as a byproduct.
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Explanation: When electricity passes through the filament or LED in the bulb, it causes the material to emit light. However, due to resistance, some of the electrical energy is also converted into heat.
Energy Transformations:
Electrical energy → Light energy + Heat energy
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3. Computer Monitor
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Input Energy: Electrical energy
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Output Energy: The computer monitor primarily converts electrical energy into
light energy to display images on the screen. It also generates some
heat energy as a byproduct due to internal components like the backlight and circuitry.
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Explanation: The electrical energy powers the display technology (e.g., LCD, LED), which emits light to create images. Additionally, the internal components generate heat during operation.
Energy Transformations:
Electrical energy → Light energy + Heat energy
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4. Iron
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Input Energy: Electrical energy
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Output Energy: The iron converts electrical energy into
heat energy to produce the heat required for ironing clothes. It may also produce some
sound energy due to the movement of internal components.
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Explanation: When electricity flows through the heating element in the iron, it generates heat. The sound energy is produced by vibrations from the motor or other moving parts.
Energy Transformations:
Electrical energy → Heat energy + Sound energy
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Final Answer
Summarizing the energy transformations for each device:
1.
Electric Kettle:
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Heat energy
2.
Light Bulb:
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Light energy,
Heat energy
3.
Computer Monitor:
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Light energy,
Heat energy
4.
Iron:
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Heat energy,
Sound energy
Boxed Final Answer:
\[
\boxed{
\begin{array}{l}
\text{Electric Kettle: Heat energy} \\
\text{Light Bulb: Light energy, Heat energy} \\
\text{Computer Monitor: Light energy, Heat energy} \\
\text{Iron: Heat energy, Sound energy}
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of energy transformation worksheet.
