Physics: Power, Energy, and Renewable Resources
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Questions and Answers

What is the term for the transfer of energy between different stores?

  • Energy transmission
  • Energy transfer (correct)
  • Energy conversion
  • Energy transformation

    • What is the ratio of the useful energy output to the total energy supplied?

  • Efficiency (correct)
  • Energy output
  • Energy conversion
  • Energy input

    • What type of energy transfer occurs when a fire is used to heat up an object?

  • Heating (correct)
  • Radiation
  • Conduction
  • Convection

    • What is the purpose of a Sankey diagram?

    <p>To represent the transfer of input energy into useful energy and wasted energy</p> Signup and view all the answers

    What is the method of heat transfer in solids and liquids?

    <p>Conduction</p> Signup and view all the answers

    What is the principle that states that the total energy before is equal to the total energy after?

    <p>Conservation of energy</p> Signup and view all the answers

    What is the formula for calculating power?

    <p>P = W / t</p> Signup and view all the answers

    What is the main advantage of renewable energy sources?

    <p>They have a potentially infinite energy supply</p> Signup and view all the answers

    What is a disadvantage of fossil fuels?

    <p>They release greenhouse gases that cause global warming</p> Signup and view all the answers

    What is an example of a renewable energy source?

    <p>Hydroelectricity</p> Signup and view all the answers

    What is a characteristic of nuclear power?

    <p>A small amount of radioactive material produces a lot of energy</p> Signup and view all the answers

    What occurs during the generation of electricity?

    <p>Energy is transferred</p> Signup and view all the answers

    What is the characteristic of a surface that makes it a good absorber and emitter of infrared radiation?

    <p>Dull texture</p> Signup and view all the answers

    What is the relationship between the surface area of a body and the amount of infrared radiation it emits?

    <p>The larger the surface area, the more radiation it emits</p> Signup and view all the answers

    What is the formula for calculating the gravitational potential energy of an object?

    <p>E_p = m × g × h</p> Signup and view all the answers

    What is the definition of power in terms of energy and time?

    <p>Power is the rate at which energy is transferred</p> Signup and view all the answers

    What is the formula for calculating the work done on an object?

    <p>W = F × d</p> Signup and view all the answers

    What is the purpose of a shiny surface in reducing unwanted energy transfer?

    <p>To reflect radiation and reduce energy transfer</p> Signup and view all the answers

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