1. cordless power drill 2. car 3. microwave oven 4. cell phone 6. sun 7. solar powered flood light 8. corded pencil sharpener a. nuclear---light----thermal energy b. light--- electrical---thermal energy c. chemical---electrical---mechanical +sound + heat d. electrical----mechanical + sound + heat e. electrical---thermal + light + sound energy f. chemical---electrical---sound +thermal energy g. chemical---mechanical---sound + thermal energy h. chemical---electrical--light +sound +thermal

Question

02-03-2024
Chemistry

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1. cordless power drill 2. car 3. microwave oven 4. cell phone 6. sun 7. solar powered flood light 8. corded pencil sharpener a. nuclear---light----thermal energy b. light--- electrical---thermal energy c. chemical---electrical---mechanical +sound + heat d. electrical----mechanical + sound + heat e. electrical---thermal + light + sound energy f. chemical---electrical---sound +thermal energy g. chemical---mechanical---sound + thermal energy h. chemical---electrical--light +sound +thermal

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icetornato icetornato · Answer 1 · 2024-03-02T04:16:51+01:00

Let's match each item with the correct sequence of energy conversions:

1. Cordless power drill: d. electrical ---- mechanical + sound + heat
Explanation: The drill runs on electrical energy from its battery, which is converted into mechanical energy to rotate the drill bit. Some of the electrical energy may also be converted into sound and heat energy due to friction.

2. Car: c. chemical ---- mechanical + sound + heat
Explanation: The car engine burns fuel (chemical energy) to produce mechanical energy to move the car. Sound and heat energy are also generated as by-products of combustion.

3. Microwave oven: e. electrical --- thermal + light + sound energy
Explanation: The microwave oven uses electrical energy to generate microwaves, which are a form of electromagnetic radiation. These microwaves cause the water molecules in food to vibrate, generating thermal energy (heat). Some electrical energy may also be converted into light and sound energy.

4. Cell phone: b. light --- electrical --- thermal energy
Explanation: The cell phone receives light signals from cell towers, which are converted into electrical signals. These electrical signals are then processed by the phone's components, generating some thermal energy as a by-product.

5. Sun: a. nuclear --- light --- thermal energy
Explanation: The sun produces energy through nuclear fusion reactions in its core, generating light and heat (thermal energy) as by-products.

6. Solar powered flood light: f. chemical --- electrical --- sound + thermal energy
Explanation: The solar panel converts sunlight (chemical energy) into electrical energy, which is used to power the floodlight. Some of the electrical energy may be converted into sound and thermal energy due to inefficiencies in the system.

7. Corded pencil sharpener: g. chemical --- mechanical --- sound + thermal energy
Explanation: The pencil sharpener is operated by hand, using mechanical energy to turn the blades and sharpen the pencil. Some of the mechanical energy may be converted into sound and thermal energy due to friction.

8. Microwave oven: e. electrical --- thermal + light + sound energy (Note: Already matched with item 3)
Explanation: The microwave oven uses electrical energy to generate microwaves, which are a form of electromagnetic radiation. These microwaves cause the water molecules in food to vibrate, generating thermal energy (heat). Some electrical energy may also be converted into light and sound energy.