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lesson 10 — 1st online lesson
2.10 Energy
calculation's
1 / 19
volgende
Slide 1:
Tekstslide
energy calculations
Voortgezet speciaal onderwijs
Leerroute 1
In deze les zitten
19 slides
, met
interactieve quizzen
en
tekstslides
.
Start les
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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
E
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1
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Slide 10 - Tekstslide
E
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=
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η
η: efficiency (%)
E
u
: Energy useful (J)
E
t
: 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:
E
f
f
i
c
i
e
n
c
y
=
(
t
o
t
a
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e
n
e
r
g
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e
n
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r
g
y
)
⋅
1
0
0
%
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:
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
f
f
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c
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e
n
c
y
=
(
8
0
2
0
)
⋅
1
0
0
%
=
2
5
%
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
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