1. Energy and electricity
Write a definition for the following words:
Heat____________________________________________________________________________________________
Temperature______________________________________________________________________________________
Radiation
Thermal ________ is the transfer of ________ energy. All objects _____ and absorb radiation. The ______ an object the more energy it radiates. Different materials transfer heat at different rates. ______ surfaces give out more thermal radiation than ______ surfaces.
black emit heat white hotter radiation
Convection
Convection is the transfer of heat energy in ________ and ________. Draw an arrow on the diagram to show the convection current.
What are the 3 methods by which heat can be transferred:
________ ________ ________
Potassium permangenate (purple crystals)
Conduction
Conduction transfers heat energy in solids. Thermal conductors are good at transferring heat e.g. ________________
________________________________
Thermal insulators are materials through which heat is not easily transferred e.g. __
heat
Energy and electricity
What can be done to reduce heat loss in the home? _____________ ________________________________________________________________________________________________________
What type of energy do you find in all energy transformations?
________________________
Name the different types of energy:
_______________
Draw a sankey diagram to show the energy transfer in a 60J light bulb in which of 54 is wasted as heat:
What energy changes are shown in the pictures:
___________
Not all energy is changed into useful forms.
What is the equation for efficiency:

2. Energy and electricity
Calculating the cost of electricity
The different energy resources have different advantages and disadvantages summarise some of these in the table:
If electricity cost 2p per kilowatt hour, how much will it cost to cut a large lawn with a 1500w mower that takes 3 hours?
Energy and electricity
Resources
Advantage
Disadvantages
In the national grid what is the role of step up and step down transformer?
Step up transformers_______________________________
_______________________________________________
Step down transformers_____________________________________
What renewable energy resources are there?
________________________________________________________________________________________________________________________________________
What things do you need to consider when choosing an energy resource?__
_________________________________________________________________________________________________________
Fill in the boxes to show the energy changes that occur at each stage in a power station:
boiler
turbine
generator
transformer