1. P1a Physics Revision

2. To give out thermal radiation _ _ _ _

3. Does a hotter object give out more or less thermal energy?

4. Poor absorbers and emitters of radiation have _ _ _ _ _ surfaces

5. Draw a convection current in a lava lamp
Draw a convection current in a lava lamp. Is the fluid that rises more or less dense than fluid that falls?

6. This is a heat sink. It sits on top of a chip
inside a computer and stops the chip from getting hot.
What feature does the heat sink
have to help it cool faster? (hint think about the shape)

7. What would the temperature / time graph be of a nuclear explosion
What would the temperature / time graph be of a nuclear explosion? (Hint goes back to room temp.)

8. Name two waste energy sources from my car

9. Find the efficiency of these two light bulbs
Electric energy in
Useful Light energy out
14 joules per second
 8 joules per second
100 joules per second
 25 joules per second

10. Energy that is not transferred into something useful.
_ a _ _ e _ Energy

11. ?J/s heat energy (given to the surroundings)
100 J/s electrical energy
? J/s light energy
?J/s heat energy (given to the surroundings)

12. Energy transferred (kilowatt-hours)
time (hours)
power (kilowatts) = x

13. 500 watt lamp used for 10 hours…
Price of a kilowatt-hour = 9p
500 watt lamp used for 10 hours…
How much does it cost to run?

14. Units of energy.. _ _ _ _ _ _

15. Connects power stations to homes.. _ a _ i o _ a_ _ _ I _

16. This substation (a step up transformer)
increases the voltage and decreases the current.
Why would you want to decrease the current?

17. non-renewable energy sources
Name four
non-renewable energy sources

18. Chemical energy
Thermal energy
Electric energy
kinetic energy
In a thermal power station in
what order do these energy changes occur?

19. _ e o _ _ e _ _ a _ power stations
In volcanic areas hot water and steam rise
from the ground and are used to power
turbines to produce electricity.
These are called…
_ e o _ _ e _ _ a _ power stations

20. Name as many types
of renewable energy
sources as possible

21. What are the energy
changes in a wind turbine?
Hint – only two
types
of energy