Unit 1: Introduction to Energy
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Questions and Answers

What is the definition of energy?

  • The ability to create light
  • The ability to convert matter into energy
  • The ability to do work (correct)
  • The ability to create heat

Which energy resource is mentioned as being plentiful but requiring a large capital investment?

  • Solar energy
  • Geothermal energy
  • Wind energy (correct)
  • Hydropower

How is the energy of hot rocks and trapped liquids in the depths of the earth utilized?

  • Used for nuclear fusion
  • Released as electricity (correct)
  • Converted into light energy
  • Converted into mechanical energy

What is the unit used to measure mechanical energy?

<p>Joule (A)</p> Signup and view all the answers

Which unit of electrical energy is convenient and commonly used in practice?

<p>Kilowatt-hour (A)</p> Signup and view all the answers

How is the conversion from watt-hours to joules calculated?

<p>$1 Wh = 3600 J$ (D)</p> Signup and view all the answers

What is a potential drawback of using nuclear energy?

<p>Generation of long-lived radioactive substances (B)</p> Signup and view all the answers

Why are most renewable energy resources considered unreliable?

<p>Dependency on weather conditions (A)</p> Signup and view all the answers

Which aspect of PV cell manufacturing involves hazardous materials?

<p>Cleaning and purifying the semiconductor surface (A)</p> Signup and view all the answers

Why is energy considered crucial for the development of modern civilization?

<p>To meet the ever-growing energy demands (A)</p> Signup and view all the answers

What makes energy resources significant for every country in the world?

<p>Their role in wealth generation and economic development (A)</p> Signup and view all the answers

Why is fossil fuel use a hotly debated topic globally?

<p>Given their association with economic development (A)</p> Signup and view all the answers

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