lesson 10 — 1st online lesson

2.10 Energy

calculation's

1 / 19

Slide 1: Diapositive

energy calculationsVoortgezet speciaal onderwijsLeerroute 1

Cette leçon contient 19 diapositives, avec quiz interactifs et diapositives de texte.

Éléments de cette leçon

2.10 Energy

calculation's

Slide 1 - Diapositive

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 - Diapositive

Useful energy

wasted energy

Efficiency

Slide 3 - Diapositive

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 - Diapositive

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 - Diapositive

The efficiency of a construction lamp

Slide 6 - Diapositive

The efficiency of a construction lamp

Slide 7 - Diapositive

Useful

The efficiency of a construction lamp

Slide 8 - Diapositive

Useful

Wasted

The efficiency of a construction lamp

Slide 9 - Diapositive

E f f i c i e n c y = (\frac{​ u s e f u l e n e r g y ​ ​}{​ t o t a l e n e r g y ​}) \cdot 100

Slide 10 - Diapositive

E f f i c i e n c y = (\frac{​ u s e f u l e n e r g y ​ ​}{​ t o t a l e n e r g y ​}) \cdot 100

= (\frac{​ E ^{​ u ​ ​} ​ ​}{​ E ^{​ t ​ ​} ​}) \cdot 100

η: efficiency (%)
Eu: Energy useful (J)
Et: energy total (J)

Slide 11 - Diapositive

The efficiency of a construction lamp

Slide 12 - Diapositive

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 - Diapositive

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 = (\frac{​ u s e f u l e n e r g y ​ ​}{​ t o t a l e n e r g y ​}) \cdot 100

Slide 14 - Diapositive

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 = (\frac{​ u s e f u l e n e r g y ​ ​}{​ t o t a l e n e r g y ​}) \cdot 100

E f f i c i e n c y = (\frac{​ 2 0 ​ ​}{​ 8 0 ​}) \cdot 100

= 25

Slide 15 - Diapositive

A certain light bulb uses 200 J of electrical energy.

It produces 20 J of light energy.

Calculate its efficiency

10 %

20%

40%

Slide 16 - Quiz

These fairy lights use 230 J of electrical energy and produce 92 J of light energy. Calculate their efficiency

20 %

25%

60%

Slide 17 - Quiz

Total energy = 1000000J

Useful energy = 650000J

Calculate the efficiency of this airplane.

50%

65%

35%

80%

Slide 18 - Quiz

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 - Diapositive

lesson 10 — 1st online lesson

Éléments de cette leçon

Slide 1 - Diapositive

Slide 2 - Diapositive

Slide 3 - Diapositive

Slide 4 - Diapositive

Slide 5 - Diapositive

Slide 6 - Diapositive

Slide 7 - Diapositive

Slide 8 - Diapositive

Slide 9 - Diapositive

Slide 10 - Diapositive

Slide 11 - Diapositive

Slide 12 - Diapositive

Slide 13 - Diapositive

Slide 14 - Diapositive

Slide 15 - Diapositive

Slide 16 - Quiz

Slide 17 - Quiz

Slide 18 - Quiz

Slide 19 - Diapositive

Plus de leçons comme celle-ci

Lesson 13 — Energy calculations

Lesson 8 — 2.5 Law of conservation of energy

Lesson 9 — Test

Lesson 12 — 2.5 Law of conservation of energy

lesson 11 — 2.10

Lesson 11

Efficiency

P3–1B–010—03-02-2020