P1a Physics Revision

To give out thermal radiation _ _ _ _

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

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

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?

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)

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.)

Name two waste energy sources from my car

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

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

?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)

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

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?

Units of energy.. _ _ _ _ _ _

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

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

non-renewable energy sources Name four non-renewable energy sources

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

_ 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

Name as many types of renewable energy sources as possible

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