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Energy - Heating and Insulating
Find out about solar panels in this quiz.

Energy - Heating and Insulating

This GCSE Physics Energy quiz takes a look at heating and insulating. Energy efficiency in buildings usually involves using thermal insulation to hold in the heat. Heating and insulating buildings has become a major agenda for many mainstream politicians. This has resulted in various projects allowing home owners to obtain low cost insulation as the government recognises that not only will this help save money, but also reduce environmental emissions as less fuel needs to be burnt to heat homes. You may have heard people saying 'close that door and keep the cold out'. This is incorrect as heat only flows from higher temperatures to lower temperatures. Cold doesn't move, cold is NOT a form of energy. It would be more accurate to say '... keep the cold air out'.

Which of the following formulas is used to calculate specific heat capacity?
E = m x c x Θ
E = (m x c)Θ
E = m x Θ
E = c x Θ
It is used to calculate how much energy would be needed to heat a substance up to a specific temperature, but you will often be required to rearrange it to carry out calculations on the higher tier paper
What was the change in temperature of a material with a specific heat capacity of 1,000 J kg-1 oC-1, a mass of 2 kg which absorbed 500 joules of energy?
Did you try working it out in your head first or did you reach straight for the calculator (after rearranging the equation)?
How much energy is required to heat a block of material of mass 4 kg by 10oC whose specific heat capacity is 800 J kg-1 oC-1?
3,200 J
32,000 J
16,000 J
1,600 J
You should be able to do this in your head ~ 10 times 800 is 8000, multiply that by 4 ~ 4 x 8 is 32, so the answer must be 32,000. If you practise working out calculations in your head as often as you can, then during the exam, it can act as a check on what you have worked out on your calculator
What is specific heat capacity?
The amount of energy required to change the temperature of 10 g of a substance by 1oC
The amount of energy required to change the temperature of 1 g of a substance by 1oC
The amount of energy required to change the temperature of 1 g of a substance by 1 K
The amount of energy required to change the temperature of 1 kg of a substance by 1oC
Materials with high specific heat capacities can be used to store heat when it is available to be released at a later time
If a wall has a high U-value, will it allow more or less heat to flow through it than a wall with a low U-value?
The same
Impossible to tell
U-values are simply a measure of how much heat can pass through a material under the same conditions
What do U-Values measure?
How effective a material is as a conductor of heat
How effective a material is as an insulator
How effective a material is at conducting electricity
How effective a material is as at absorbing carbon dioxide
They are a measure of how much energy can pass through an insulator and are measured using a standard set of conditions so that they can be easily compared
Calculate the specific heat capacity of a material whose mass is 1 kg which required 300 J of energy in order to be heated from 1oC to 5oC.
25 J kg-1 oC-1
50 J kg-1 oC-1
75 J kg-1 oC-1
100 J kg-1 oC-1
Being able to rearrange formulas is a crucial skill that you will need to have for any exam
What are the units of specific heat capacity?
J kg oC
J kgsoC
 J kg-1 oC-1
You should have eliminated answers 2 and 3 immediately as the symbol for kilograms is wrong (it should never be written with a capital 'K' or have an 's' added at the end)
A solar panel that contains water which is heated by radiation from the sun can be used for what purposes?
Heat building
Heat domestic water supply
The heat cannot be transferred
Heat both building and domestic water supply
Solar energy can be used to obtain heat and electricity. Because the energy used comes from the Sun, after installation of the solar panels, it is free
If a material is a good insulator, what size U-Value will it have?
Neither large nor small
A negative value
A lower value means less heat passes through the material and it is therefore a good insulator
You can find more about this topic by visiting BBC Bitesize - Energy and heating

Author:  Martin Moore

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