What do you already know about energy

• Natuurkunde
• Middelbare school
• vwo
• Leerjaar 3

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

What is the range of this thermometer?

1. 0 degrees Celsius
2. -40 to 120 degrees celsius
3. -40 to 50 degrees celsius
4. 30 degrees fahrenheit

The scale on a thermometer (celsius) is based on...

1. temperature-scale of Kelvin
2. boiling point and melting point of water
3. boiling point and melting point of alcohol
4. not based on anything

Thermometer

Range - maximum to minimum 

(what temperatures can you measure)

Reading the middle part of the thermometer

22 kW =

1. 2,2 . 10^4 W
2. 2,2 . 10^3 W
3. 2,2 . 10^2 W
4. 2,2 . 10^1 W

17 MW =

1. 1,7 . 10^4 kW
2. 170 . 10^4 kW
3. 1700 . 10^4 kW
4. 17 . 10^4 kW

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

Conductors

Electricity and heat can travel through easily

Mostly metals are used for this

Insulators

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

plastics

Thing with a lot of air in them

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?

Power

Formula for power is:

P = U x I

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

Formula for energy

Formula for energy is :

E = P x t

Joules = Watt (J/s) x sec

kWh = kilowatt x hours