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Lesson 12 — 2.5 Law of conservation of energy
The law of
conservation
of energy
1 / 22
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The law of conservation of energy
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The law of
conservation
of energy
Slide 1 - Diapositive
The law of
conservation
of energy
What is the law of conservation of energy?
Can you think of real world examples?
Where does energy come from?
Where does energy go?
Slide 2 - Diapositive
Checking the homework
Slide 3 - Diapositive
This lesson
Class discussion
Checking the homework
The law of conservation of energy
Efficiency
Slide 4 - Diapositive
Learning goals
Describe the first two laws of thermodynamics in your own words.
Give real world examples of the law of conservation of energy.
Explain what is meant by useful energy and wasted energy.
Explain what is meant by efficiency.
Slide 5 - Diapositive
Watch the upcoming video.
Answer the following questions:
What are the first two laws of thermodynamics?
Why is it impossible to create a perpetual motion machine?
Exercise
Slide 6 - Diapositive
Slide 7 - Vidéo
What are the first two laws of thermodynamics?
1) Energy cannot be created or destroyed
2) Energy tends to spread out in the form of heath
Slide 8 - Diapositive
Why is it impossible to create a perpetual motion machine?
You cannot get more energy out then you put in.
You loose energy in the form of heath.
Slide 9 - Diapositive
Together with your neighbour
think of three examples of the law of conservation of energy in real life
Exercise
Slide 10 - Diapositive
Newtons Cradle
Slide 11 - Diapositive
Slide 12 - Diapositive
Slide 13 - Vidéo
Link
Slide 14 - Diapositive
The law of
conservation
of energy
You cannot get more energy out than you put in
Slide 15 - Diapositive
Useful energy
wasted energy
Efficiency
Slide 16 - Diapositive
80 J/s of electrical energy.
20 J/s of light energy
A construction lamp
60 J/s of thermal energy
Slide 17 - Diapositive
The efficiency of a construction lamp
A construction lamp uses 80 joules/second
20 J/s is turned into useful energy
What is the efficiency of this construction lamp?
It has an efficiency of 25%
Slide 18 - Diapositive
E
f
f
i
c
i
e
n
c
y
=
(
t
o
t
a
l
e
n
e
r
g
y
u
s
e
f
u
l
e
n
e
r
g
y
)
⋅
1
0
0
%
Slide 19 - Diapositive
E
f
f
i
c
i
e
n
c
y
=
(
t
o
t
a
l
e
n
e
r
g
y
u
s
e
f
u
l
e
n
e
r
g
y
)
⋅
1
0
0
%
=
(
E
t
E
u
)
⋅
1
0
0
%
η
η: efficiency (%)
E
u
: Energy useful (J)
E
t
: energy total (J)
Slide 20 - Diapositive
Working
independently
Homework:
The workbook exercises of 2.5 including E
The yellow block exercises of 2.10
Slide 21 - Diapositive
Learning goals
Describe the first two laws of thermodynamics in your own words.
Give real world examples of the law of conservation of energy.
Explain what is meant by useful energy and wasted energy.
Explain what is meant by efficiency.
Slide 22 - Diapositive
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