Question 1: Define renewable energy and give two examples of renewable energy sources.

Answer: Renewable energy is energy that is replenished naturally and can be used sustainably. Examples include solar energy and wind energy.

Question 2: Explain how solar panels convert sunlight into electrical energy.

Answer: Solar panels use photovoltaic cells to absorb sunlight, which excites electrons and creates an electric current.

Question 1: A solar panel has an area of 2 square meters and receives solar radiation of 1000 W/m². Calculate the total power incident on the panel in watts.

Answer: 2000 W

Question 2: If a wind turbine has a power output efficiency of 35% and captures wind energy at a rate of 1500 W, what is the electrical power generated in watts?

Answer: 525 W

Question 1: Describe two safety precautions that should be taken when working with solar panels or wind turbines.

Answer: Ensure electrical connections are insulated and avoid working in stormy or high-wind conditions.

Question 2: Identify three variables that can affect the efficiency of a solar panel.

Answer: Angle of sunlight, shading on the panel, and temperature of the panel surface.

Question 1: A community installed a 50 kW solar power system. During peak sunlight hours, it produces an average of 45 kW. If the community consumes 30 kW on average, how much excess energy is generated during peak hours?

Answer: 15 kW

Question 1: Explain the advantages and disadvantages of using wind energy as a renewable resource. Your answer should include at least three points for each side.

Answer: Advantages include being sustainable, producing no greenhouse gases, and being cost-effective in many locations. Disadvantages include noise pollution, impact on bird populations, and variability depending on wind conditions.

Question 1: Describe a real-world example of how solar energy is used in everyday life or industry, including any benefits or challenges.

Answer: Solar panels on rooftops provide electricity for homes, reducing reliance on fossil fuels and lowering energy costs, but can be affected by weather conditions and require significant initial investment.