Question 1: Define power in the context of energy transfer and state its SI unit.

Answer: Power is the rate at which energy is transferred or converted; its SI unit is the watt (W).

Question 2: Explain why nanotechnology often requires precise control of power transfer at the nanoscale.

Answer: Because at the nanoscale, small amounts of energy can cause significant effects, so precise control of power transfer ensures safety and functionality of nanodevices.

Question 3: A nanobot uses 0.5 joules of energy in 2 seconds. What is its power output in watts?

Answer: Power = Energy / Time = 0.5 J / 2 s = 0.25 W

Question 4: In a nanotechnology application, a device transfers 0.1 joules of energy every 5 seconds. What is its average power transfer?

Answer: Power = 0.1 J / 5 s = 0.02 W

Question 5: Multiple Choice: Which of the following best describes why high power transfer efficiency is critical in nanotechnology?

Answer: B) To minimize heat production and energy loss

Question 6: Fill in the blank: In nanotechnology, controlling the power transfer at the nanoscale is essential to prevent __________ and ensure the proper functioning of nanodevices.

Answer: overheating

Question 7: Describe a theoretical experiment to measure the power transfer efficiency of a nanotransistor.

Answer: The experiment involves supplying a known amount of electrical energy to the nanotransistor over a fixed period, measuring the output energy in the form of useful work or signal, and calculating efficiency using the formula: Efficiency = (Useful output energy / Input energy) × 100%. Safety precautions include working in a controlled environment to prevent overheating and ensuring precise measurement instruments are used.

Question 8: A nanodevice transfers 2 joules of energy in 4 seconds. If the device’s power consumption is 0.6 watts, how much energy does it actually transfer during this time?

Answer: Energy transferred = Power × Time = 0.6 W × 4 s = 2.4 Joules

Question 9: Data Scenario: A nanotech laser operates at 1.5 W for 10 seconds, but due to efficiency losses, only 1.2 J of energy is used for the actual process. What is the energy loss during operation?

Answer: Energy loss = Total energy supplied - Useful energy = (Power × Time) - 1.2 J = (1.5 W × 10 s) - 1.2 J = 15 J - 1.2 J = 13.8 Joules

Question 10: In industry, nanotechnology often involves transferring small amounts of energy very rapidly. Why is understanding and controlling power critical in manufacturing nanoscale devices?

Answer: Because precise control of power ensures that nanodevices operate efficiently without overheating or damage, maintaining accuracy and safety during manufacturing processes.