lesson 10 — 1st online lesson

2.10 Energy

calculation's

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Slide 1: Tekstslide

energy calculationsVoortgezet speciaal onderwijsLeerroute 1

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

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 - Tekstslide

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 - 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 = (\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 - 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 = (\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 - Tekstslide

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 - Quizvraag

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

20 %

25%

60%

Slide 17 - Quizvraag

Total energy = 1000000J

Useful energy = 650000J

Calculate the efficiency of this airplane.

50%

65%

35%

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

lesson 10 — 1st online lesson

Onderdelen in deze les

Slide 1 - Tekstslide

Slide 2 - Tekstslide

Slide 3 - Tekstslide

Slide 4 - Tekstslide

Slide 5 - Tekstslide

Slide 6 - Tekstslide

Slide 7 - Tekstslide

Slide 8 - Tekstslide

Slide 9 - Tekstslide

Slide 10 - Tekstslide

Slide 11 - Tekstslide

Slide 12 - Tekstslide

Slide 13 - Tekstslide

Slide 14 - Tekstslide

Slide 15 - Tekstslide

Slide 16 - Quizvraag

Slide 17 - Quizvraag

Slide 18 - Quizvraag

Slide 19 - Tekstslide

Meer lessen zoals deze

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