Efficiency

Efficiency
Textboek
Nova 3 HV TTO 2019-2020
1 / 20
Slide 1: Tekstslide
NatuurkundeMiddelbare schoolhavo, vwoLeerjaar 2,3

In deze les zitten 20 slides, met interactieve quizzen, tekstslides en 1 video.

Lesduur is: 15 min

Onderdelen in deze les

Efficiency
Textboek
Nova 3 HV TTO 2019-2020

Slide 2 -Tekstslide

You know how to draw and use an energy flowchart
You can make calculations using the concept of efficiency

Energy flowchart

Slide 7 -Tekstslide

Efficiency
In this example the efficiency will be calculated as follows:

40J8J
x 100 % = 20 %
I often use
a table to make a quick calculation
Efficiency is about the amount of energy which is used usefully compared to the total amount of energy you put into everything.

Slide 8 -Tekstslide

Sustainable energy
Replacing incandescent light bulbs with energy saving light bulbs will save you a lot of energy (and money).

Both lamps will convert 3 Joule of electric energy every second into light (3 W).
But since the efficiency of the energy saving light bulb is much larger, it needs less total energy to produce the same amount of light (5 times less).

Slide 10 -Tekstslide

Calculate the efficiency

Slide 11 -Open vraag

Calculate the efficiency

Slide 12 -Open vraag

Calculate the efficiency

Slide 13 -Open vraag

3,8 J of 6,5 J energy is converted into light in a lightbulb. What is the efficiency of the lightbulb?
A
171%
B
58%
C
37%
D
15%

Slide 14 -Quizvraag

Tip
You can use flowcharts to think about the usefull Energy needed for heating up the house. This will be constant regardless of the type of heater used.