View source for Applied Science AQA/Energy and Efficiency

== '''Topic Title''' ==

=== Setting Applied context  ===
It is useful for energy consultants to be able to compare the efficiency of different devices in our homes and workplaces. Energy is transferred by different devices, and the rate at which energy is transferred is called ‘power’. 

Architects and energy consultants use U values to measure how effective different materials used in buildings are as insulators. That is, how effective they are at preventing heat energy from transmitting between the inside and the outside of a building.

{| class="wikitable"
!Syllabus Content
!What you need to do
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|'''Efficiency'''

• the meaning of ‘efficiency’: 

• why efficiency is important and why a device can never be 100% efficient 

• methods of improving the efficiency of a system or device 

• the formula <math>efficiency=\frac{useful energy (or power) output}{useful energy (or power) input}</math>

• the importance of efficiency in making the best use of available energy 

• ways in which efficiency can be increased in mechanical and thermal systems 
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* Work out the efficiency.
* explain the term
* why is efficiency useful? 

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|'''U-Values'''

• examples of situations where thermal transfer needs to be maximised and situations where it needs to be minimised 

• the meaning of U values 

• the formula <math>U={\frac{Q}{At{\vartriangle}T}}</math>
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|}

=== Exploration of key ideas (must be original text, not C&P) – level checked by AQA ===
In general, point students towards the approach to take, as opposed to just giving them information.

==== The meaning of efficiency ====
Efficiency is a measure of how much work or energy is kept and not lost in a process. in many processes, work or the energy is lost, this can be through heat or sound. the efficiency is the energy output, this is divided by the energy input and is expressed as a percentage. A perfect process would of an efficiency of 100%. 
[[File:Mad scientist artlibre jn.png|alt=mad scientist|thumb|mad scientist]]

==== Concept 2 ====
explanation 2

==== Concept 3 ====
explanation 3

==== Concept 4 ====
explanation 4

=== Study Task ===
Work to do to understand this topic e.g. research, analysis

=== Careers and Organisations ===
Carry out some research into these jobs in this area.  (Feel free to add other jobs you find.)
{| class="wikitable"
!''Research these roles:'' 
!What are the '''benefits''' of this role to '''society'''?
!What '''organisations''' would employ someone in this role? 
(Where would they work?)
!What would someone in this role '''have to do''' within the organisation?
!What scientifically-related '''skills''' do they need to have? 
What '''techniques''' do they need to have mastered?
!What '''experience''' is needed to undertake this role and its responsibilities within an organisation?
!What '''other science personnel''' will they work with in their organisation.
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|Job 1
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|Job 2
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=== Relevant practical/s ===
– relating to criteria skills

=== Quick questions ===
{{Example|quick questions}}
{{DropBox|Solution|click to reveal answer|hidden=hidden}}

=== Exam-style questions ===
– can we use old AQA qs… e.g. from more than 5 years ago?  With Examiner comments
{{DropBox|Solution|click to reveal answer|hidden=hidden}}
=== Links ===
to other sections within this book

to good external websites (including AQA website, wikipedia, relevant applications / companies) - also considering links in spec

=== References / Bibliography ===
of recommended text books

including mapped refs to existing books



[[Applied_Science_AQA|''Back to Contents'']]

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