energy calculationsMiddelbare schoolhavo, vwoLeerjaar 1
In deze les zitten 20 slides, met tekstslides en 1 video.
Onderdelen in deze les
Energy
Calculations + §2.6 & 2.7
Slide 1 - Tekstslide
Slide 2 - Video
In pairs of two
Step 1)
For 10 minutes
One of you reads and takes notes of §2.6.
The other reads and takes notes of §2.7
Step 2)
Discuss what you learned
Go over each others notes
think of one question per paragraph
Step 3
Share your notes with another pair close to you
Slide 3 - Tekstslide
Recap
Slide 4 - Tekstslide
Useful energy
wasted energy
Efficiency
Slide 5 - Tekstslide
Efficiency=(totalenergyusefulenergy)⋅100
%
Slide 6 - Tekstslide
Efficiency=(totalenergyusefulenergy)⋅100
%
=(EtEu)⋅100
%
η
η: efficiency (%)
Eu: Energy useful (J)
Et: energy total (J)
Slide 7 - Tekstslide
2.10
Energy snaky diagram
Slide 8 - Tekstslide
Which lamp is more efficient?
A
B
Slide 9 - Tekstslide
Slide 10 - Tekstslide
Calculations — Exercise 1
Consider a machine that puts out 6070 joules of useful work. As a by product it also produces 2500Joules of heat.
Calculate the efficiency of this machine.
Slide 11 - Tekstslide
Consider a machine that puts out 6070 joules of useful work. As a by product it also produces 2500Joules of heat.
Calculate the efficiency of this machine.
Given
Eu = 6070 J
Ew = 2500 J
Et = 6700 + 2500 = 8570 J
Asked
Calculate the efficiency of this machine
Fromula
Calculation
Slide 12 - Tekstslide
Consider a machine that puts out 6070 joules of useful work. As a by product it also produces 2500Joules of heat.
Calculate the efficiency of this machine.
Given
Eu = 6070 J
Ew = 2500 J
Et = 6700 + 2500 = 8570 J
Asked
Calculate the efficiency of this machine
Fromula
Calculation
=(EtEu)⋅100
η
%
Slide 13 - Tekstslide
Consider a machine that puts out 6070 joules of useful work. As a by product it also produces 2500Joules of heat.
Calculate the efficiency of this machine.
Given
Eu = 6070 J
Ew = 2500 J
Et = 6700 + 2500 = 8570 J
Asked
Calculate the efficiency of this machine
Fromula
Calculation
=(EtEu)⋅100
η
%
=(85706070)⋅100
η
% = 70,8 %
Slide 14 - Tekstslide
Calculations — Exercise 2
A machine has an efficiency of 25 %. It creates 350 joules of useful work. Calculate its total energy input.
Slide 15 - Tekstslide
A machine has an efficiency of 25 %. It creates 350 joules of useful work. Calculate its total energy input.
Given
η = 25 %
Euseful = 350 J
Asked
Calculate the total energy input of this machine
Fromula
Calculation
Slide 16 - Tekstslide
Given
η = 25 %
Euseful = 350 J
Asked
Calculate the total energy input of this machine
Fromula
Calculation
Slide 17 - Tekstslide
Calculations — Exercise 3
An average car uses 8.9 liters of gasoline per 100 kilometre. One liter of gasoline contains 31536000 joules. If a car drives 150 kilometre, and during this journey it creates 32450544 joules of heat and sound energy combined, what would be its efficiency?
Slide 18 - Tekstslide
An average car uses 8.9 liters of gasoline per 100 kilometre. One liter of gasoline contains 31536000 joules. If a car drives 150 kilometre, and during this journey it creates 32450544 joules off heat and sound energy combined, what would be its efficiency?
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