# What do you already know about energy

What do you already know about energy
Today we will see what you still know or already know about this topic

In between the questions there will be some information
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Slide 1: Tekstslide
NatuurkundeMiddelbare schoolvwoLeerjaar 3

In deze les zitten 37 slides, met interactieve quizzen en tekstslides.

Lesduur is: 30 min

## Onderdelen in deze les

What do you already know about energy
Today we will see what you still know or already know about this topic

In between the questions there will be some information

#### Slide 1 -Tekstslide

What is the range of this thermometer?
A
0 degrees Celsius
B
-40 to 120 degrees celsius
C
-40 to 50 degrees celsius
D
30 degrees fahrenheit

#### Slide 2 -Quizvraag

The scale on a thermometer (celsius) is based on...
A
temperature-scale of Kelvin
B
boiling point and melting point of water
C
boiling point and melting point of alcohol
D
not based on anything

#### Slide 3 -Quizvraag

Thermometer
Range - maximum to minimum
(what temperatures can you measure)

Reading the middle part of the thermometer

22 kW =
A
2,2 . 10^4 W
B
2,2 . 10^3 W
C
2,2 . 10^2 W
D
2,2 . 10^1 W

17 MW =
A
1,7 . 10^4 kW
B
170 . 10^4 kW
C
1700 . 10^4 kW
D
17 . 10^4 kW

#### Slide 6 -Quizvraag

Powers of ten
k = 1 000 = 10^3
M = 1 000 000 = 10^6
G = 1 000 000 000 = 10^9

m = 1/1 000 = 10^-3
micro = 1/1 000 000 = 10^-6
nano = 1/1 000 000 000 = 10^-9

plastic
copper
iron
Feathers
Aluminium

Wood
Insulators
Conductors

#### Slide 8 -Sleepvraag

Conductors
Electricity and heat can travel through easily

Mostly metals are used for this

#### Slide 9 -Tekstslide

Insulators
Heat and electricity will have a hard time moving throught the material

plastics
Thing with a lot of air in them

#### Slide 10 -Tekstslide

You are mixing a smoothie using a blender. at that moment the current throught the wire is 2.17 A. The blender is connected to a socket via a plug. What is the power of the blender?

#### Slide 11 -Open vraag

Power
Formula for power is:

P = U x I

#### Slide 12 -Tekstslide

Hasans father has asked him to hover the living room. This takes him 15 min. The power rating of the vacuum cleaner is 600 W. Calculate how much energy (in kWh) the vacuum cleaner has consumed during that time

#### Slide 13 -Open vraag

Formula for energy
Formula for energy is :
E = P x t
Joules = Watt (J/s) x sec
kWh = kilowatt x hours

#### Slide 14 -Tekstslide

Battery

wind
Uranium

Sun
Oil

Electrical energy

Food
Water
Coal

Chemical energy

Nuclear energy
Kinetic energy

#### Slide 15 -Sleepvraag

What kind of energy conversion takes place in a wind-turbine
A
Electrical to chemical
B
Chemical to nuclear
C
Kinetic to Electrical
D
Kinetic to chemical

#### Slide 16 -Quizvraag

Energy source
What is an energy source

Where does energy come from

#### Slide 17 -Tekstslide

Form of energy
What is the type of energy

Way the energy is transported or stored

#### Slide 19 -Tekstslide

Energy conversion
Method to change one type of energy to another

Chemical energy in fossil fuels -> thermal energy -> electrical energy (powerplant)

#### Slide 20 -Tekstslide

What is the correct formula for
heat-loss
A
Q = U x A x dT
B
U = Q x A x dT
C
A = U x Q x dT
D
dT = U x A x Q

#### Slide 21 -Quizvraag

What is the unit for specific heat?
A
J/g°C
B
°C/Jg
C
g/J°C
D
J/°Cg

#### Slide 22 -Quizvraag

Heat 1,25∙10^3 g of water until the temperature has increased by 75 °C. The specific heat of water is 4.2 J/g∙°C.

Select the correct heat supplied.
A
3,9105J
B
3,9104J
C
3,9103J
D
3,9102J

#### Slide 23 -Quizvraag

Specific heat
The specific heat of a substance is the amount of energy required to increase the tempeture of 1 gram of any substance by 1 degree.

From water it is:
The character is c (small letter)
This is a substance property.
4,2Jg0C
/

#### Slide 24 -Tekstslide

Heat
Heat = specific heat x mass x temperature difference

#### Slide 25 -Tekstslide

If the specific heat is small, then...
A
warming and cooling takes a short amount of time
B
warming and cooling takes a large amount of time
C
heating takes long, cooling is quick
D
heating is quick, cooling takes long

#### Slide 26 -Quizvraag

Degrees
Jouls per gram per degree
Gram
Joules
C
J
g
J/g/C
Heat energy
Mass
specific heat
Temperature change
Q
m
c
ΔT

#### Slide 27 -Sleepvraag

Which is NOT a type of heat transfer?
A
B
Convection
C
Heat flow
D
Conduction

#### Slide 28 -Quizvraag

Heat transfer
The movement of heat energy from one warmer place to another colder place through conduction, convection or radiation

#### Slide 29 -Tekstslide

Heat transfer
by convection
Heat can move around freely in a liquid. Therefore cooking is a great way to heat up your food.

The liquid will make sure that all parts of the food come into contact with the heat, while at the same time it prevents the food from burning because it will not get too hot at any one point.

#### Slide 30 -Tekstslide

Heat transfer
by conduction
Metals can conduct heat very well, that's why for cooking we mainly use metal pans.

But some metals conduct better than others, therefore you see a lot of copper pans in a professional kitchen.

Keep in mind that if a material heats up very quickly, it will cool down quickly too.

#### Slide 31 -Tekstslide

Heat transfer
Heat radiation is one way for the heat to move around. Every object with a lot of heat in it, can emit this heat again as heat radiation.

Matt black objects are very good at absorbing heat, but can also radiate a lot of heat as well.

Heat radiation is also called infrared radiation. This type of radiation cannot pass through glass and is reflected by shiny objects.

#### Slide 32 -Tekstslide

Heat radiation is one way for the heat to move around. Every object with a lot of heat can emit heat as heat radiation. Matt black objects are very good at absorbing heat, but can also radiate a lot of heat as well.

Heat radiation is also called infrared radiation. This type of radiation cannot pass through glass and is reflected by shiny objects.
Summary heat transfer
Conduction:
The flow of heat through physical contact,
Some materials conduct better than others

Convection:
Heat transfer due to motion of a fluid or gas.
If the temperature rises, the density drops making the fluid or gas go up

Heat transfer by electromagnetic waves.
When these electromagnetic waves are absorbed by an object the object gets warm.

#### Slide 33 -Tekstslide

Heat radiation waves need air to transfer heat
A
true
B
false

#### Slide 34 -Quizvraag

Heat transfer is caused by
A
Heat
B
Absorption
C
Change in temperatures
D
The oven

#### Slide 35 -Quizvraag

In which phase is conduction the only means of heat transfer, as convection cannot take place?
A
solid
B
liquid
C
gas

#### Slide 36 -Quizvraag

Good luck
See you only once more before the testweek

recap chapter 3.1 to 3.3

Practice material in classroom and info in magister