Question 1: Define the term 'renewable energy resource'.

Answer: An energy resource that can be replenished naturally over a short period of time, such as solar, wind, or hydro power.

Question 2: Explain why the use of fossil fuels has decreased in some countries in recent years.

Answer: Due to environmental concerns, climate change, and the development of cleaner, renewable energy sources leading to reduced reliance on fossil fuels.

Question 3: Describe how wind turbines generate electricity.

Answer: Wind turbines convert the kinetic energy of moving air into mechanical energy, which then drives a generator to produce electricity.

Question 1: A wind turbine has a power output of 2.5 MW. If it operates at this capacity for 24 hours, how much energy does it produce in kilowatt-hours (kWh)? Use the formula: Energy (kWh) = Power (kW) × Time (hours).

Answer: 60,000 kWh

Question 2: A country reduced its coal consumption by 15% over five years, decreasing from 20 million tonnes to a certain amount. Calculate the amount of coal used after the reduction.

Answer: 17 million tonnes

Question 1: Design a simple experiment to compare the efficiency of solar panels and wind turbines in converting renewable energy into electricity. Describe the variables you would control and safety precautions to consider.

Answer: Students would set up solar panels and wind turbines under similar environmental conditions, measuring the electrical output over the same period. Variables to control include sunlight intensity and wind speed. Safety precautions involve handling electrical equipment safely and avoiding exposure to electrical faults or moving parts.

Question 1: A report states that in the last decade, the global share of renewable energy sources in electricity generation increased from 20% to 30%. Discuss what this trend indicates about the global shift in energy resources and potential factors influencing it.

Answer: This trend indicates a growing global shift towards renewable energy sources due to environmental concerns, technological advancements, and policy changes. Factors include decreasing costs of renewables, international agreements on climate change, and increased public awareness.

Question 1: Explain three reasons why countries are increasing their use of renewable energy resources over fossil fuels.

Answer: Reasons include reducing greenhouse gas emissions, decreasing dependence on finite fossil fuel supplies, and improving energy security. Additionally, technological advances and government incentives promote renewable energy adoption.

Question 2: Multiple Choice: Which of the following is a disadvantage of relying heavily on wind energy? A) It is always available 24/7. B) It can disrupt local wildlife. C) It produces no noise. D) It requires no maintenance.

Answer:

Question 1: Identify three ways in which the trend towards increased use of renewable energy impacts the environment and society.

Answer: Increased use of renewables reduces air pollution and greenhouse gas emissions, helping combat climate change. It also decreases reliance on finite fossil fuels, promoting sustainable development, and can create new jobs in renewable energy industries, benefiting society.