Workshop 1
 Contents
|
Section B Learning about the innovation
Activity
B8 Fuels and food (cont.) |
|
Ways of storing energy
A Storing energy by making something hotter
(e.g. immersion heater in water)
-
We can store energy in water by making it hotter
- making the particles move faster.
-
This does not happen 'by itself' - need something
to make it happen, to drive the change (in this case - a power pack)
B Storing energy by 'hiding it away' (e.g.
electrolysis of water)
-
Making water hot is not the only way can use it to
store energy - we can also use store energy by pulling the molecules
of water apart (the atoms in the molecules are attracted to each other).
This is like storing energy in a spring by pulling it apart - the energy
does not make the water hotter, the energy is 'hidden away' like in a stretched
spring. Pulling apart water molecules gives hydrogen and oxygen.
-
This does not happen 'by itself' - need something
to make it happen, to drive the change (in this case - a power pack)
C Energy escaping by cooling down (e.g. hot
water cools after being heated with immersion heater)
-
Energy escapes when the water cools down - the particles
slow down.
-
This 'just happens by itself' - we can use it to
drive other changes (for example, making something hot or making something
move)
D Energy escaping by releasing energy that
was 'hidden away' (e.g. hydrogen and oxygen react together to form water)
-
Energy escapes when the hydrogen atoms and oxygen
atoms rejoin to form water - like a spring being released - the energy
'hidden away' in the hydrogen and oxygen now spreads out.
-
This 'just happens by itself' - we can use it to
drive other changes, for example, making something hot or making electricity).
Ways of storing energy: answers (from page 6)
A 1
B 3 C 2
D4
Fuels and food: answers (from pages 7 and 8)
| 1 H |
2 A C |
| 3 E G |
4 B D |
| 5 J |
6 F I |
|
