Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Energy is defined as the capacity or ability to do work. It exists in various forms such as thermal, electrical, and mechanical energy.
Natural resources are divided into two types: Renewable (e.g., Solar, Wind, and Water) and Non-renewable (e.g., Coal, Petroleum, and Natural Gas).
Non-renewable energy sources, also known as fossil fuels, take millions of years to form and release greenhouse gases like when burned.
Energy conservation refers to the practice of reducing energy consumption by using less energy or using it more efficiently.
The use of energy-efficient devices, such as (Light Emitting Diode) bulbs and (Compact Fluorescent Lamp) bulbs, significantly reduces electricity consumption compared to traditional incandescent bulbs.
Alternative energy sources like panels convert sunlight directly into electricity, providing a clean and inexhaustible source of power.
The R's of conservation—Reduce, Reuse, and Recycle—help in saving the energy required to manufacture new products.
📐Formulae
💡Examples
Problem 1:
A family replaces a incandescent bulb with a bulb. How much energy (in Watts) is saved per hour?
Solution:
Explanation:
By switching to energy-efficient lighting, of power is conserved every hour the light is in use.
Problem 2:
Why is it recommended to use a pressure cooker for cooking lentils instead of an open pot?
Solution:
A pressure cooker uses high-pressure steam which cooks food faster, saving fuel like (Liquefied Petroleum Gas).
Explanation:
Reducing cooking time directly leads to the conservation of non-renewable chemical energy stored in the cooking gas.
Problem 3:
Identify the primary gas responsible for global warming released during the combustion of fossil fuels.
Solution:
Carbon Dioxide ()
Explanation:
Burning coal and petroleum releases , which traps heat in the atmosphere, making energy conservation vital for the environment.