lesson 10 — 1st online lesson

2.10 Energy 
calculation's
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Slide 1: Tekstslide
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In deze les zitten 19 slides, met interactieve quizzen en tekstslides.

Onderdelen in deze les

2.10 Energy 
calculation's

Slide 1 - Tekstslide

Learning goals
  • Give examples of useful energy and wasted energy

  • Explain what is meant by efficiency

  • Be able to do calculations that involve energy

Slide 2 - Tekstslide


  • Useful energy

  • wasted energy

  • Efficiency

Slide 3 - Tekstslide

Useful energy
  • The amount of joules that do the work you want


Wasted energy
  • The amount of joules that do work that you don't want


Efficiency
  • The percentage of the total energy input that gets converted into useful energy.


Slide 4 - Tekstslide

The efficiency of a construction lamp

  • A construction lamp uses 80 joules/second

  • It produces 20 J of light energy per second.

  • It produces 60 J of thermal and sound energy per second.

      Slide 5 - Tekstslide

      The efficiency of a construction lamp

            Slide 6 - Tekstslide

            The efficiency of a construction lamp

                  Slide 7 - Tekstslide

                  Useful
                  The efficiency of a construction lamp

                        Slide 8 - Tekstslide

                        Useful
                        Wasted
                        The efficiency of a construction lamp

                              Slide 9 - Tekstslide

                              Efficiency=(totalenergyusefulenergy)100
                              %

                              Slide 10 - Tekstslide

                              Efficiency=(totalenergyusefulenergy)100
                              %
                              =(EtEu)100
                              %
                              η
                              • η: efficiency (%)
                              • Eu: Energy useful (J)
                              • Et: energy total (J)

                              Slide 11 - Tekstslide

                              The efficiency of a construction lamp

                                    Slide 12 - Tekstslide

                                    Calculate the efficiency of the lamp of this energy transformation diagram 
                                    Given:
                                    • Total energy = 80 Joule
                                    • Useful energy = 20 J

                                    Asked:
                                    • Calculate the efficiency of this lamp

                                    Formula:



                                    Calculation:

                                    Slide 13 - Tekstslide

                                    Calculate the efficiency of the lamp of this energy transformation diagram 
                                    Given:
                                    • Total energy = 80 Joule
                                    • Useful energy = 20 J

                                    Asked:
                                    • Calculate the efficiency of this lamp

                                    Formula:



                                    Calculation:
                                    Efficiency=(totalenergyusefulenergy)100
                                    %

                                    Slide 14 - Tekstslide

                                    Calculate the efficiency of the lamp of this energy transformation diagram 
                                    Given:
                                    • Total energy = 80 Joule
                                    • Useful energy = 20 J

                                    Asked:
                                    • Calculate the efficiency of this lamp

                                    Formula:



                                    Calculation:
                                    Efficiency=(totalenergyusefulenergy)100
                                    %
                                    Efficiency=(8020)100
                                    %
                                    =25
                                    %

                                    Slide 15 - Tekstslide


                                    A certain light bulb uses 200 J of electrical energy. 
                                    It produces 20 J of light energy. 
                                    Calculate its efficiency
                                    A
                                    10 %
                                    B
                                    5%
                                    C
                                    20%
                                    D
                                    40%

                                    Slide 16 - Quizvraag


                                    These fairy lights use 230 J of electrical energy and produce 92 J of light energy. Calculate their efficiency
                                    A
                                    20 %
                                    B
                                    25%
                                    C
                                    40
                                    D
                                    60%

                                    Slide 17 - Quizvraag


                                    Total energy = 1000000J
                                    Useful energy = 650000J
                                    Calculate the efficiency of this airplane.
                                    A
                                    50%
                                    B
                                    65%
                                    C
                                    35%
                                    D
                                    80%

                                    Slide 18 - Quizvraag

                                    Learning goals
                                    • Give examples of useful energy and wasted energy 

                                    • Explain what is meant by efficiency

                                    • Be able to do calculations that involve energy

                                    Slide 19 - Tekstslide