This document discusses teaching energy concepts at the secondary level. It provides guidance on why and how energy is taught, challenges in teaching abstract energy concepts, and examples of hands-on experiments teachers can use. Key points include: energy is an abstract quantity that represents the ability to do work, distinguishing between types of energy can provide no explanation for physical processes, and conservation of energy defies common sense. Hands-on experiments help convey ideas about energy transfers and transformations between different forms.
Examples of Convection
What is convection? The convection is the heat transfer based on the actual motion of the molecules of a substance: here involves a fluid which can be gas or liquid.
The transmission convective heat may occur only in fluids where natural movement (the fluid extracts heat from the hot zone and changes densities) or forced circulation (through a fan the fluid moves), the particles can move transporting the heat without interrupting the physical continuity of the body. Here a series of convection examples:
The heat transfer of a stove.
Hot air balloons, which are held in the air by hot air. If it cools, the balloon immediately begins to fall.
When the water vapor fogs the glass of a bath, by the hot temperature of the water when bathing.
The hand or hair dryer, which transmits heat by forced convection.
The heat transfer generated by the human body when a person is barefoot.
Radiation Examples
What is radiation? The radiation is the heat emitted by a body due to its temperature, in a process that lacks contact between bodies or intermediate fluids transported heat.
The radiation causes a body to be solid or liquid of higher temperature than another, occur immediately transfer heat to each other. The phenomenon is that of the transmission of electromagnetic waves, emitted by bodies at a higher temperature than absolute zero: the higher the temperature, the greater these waves will be.
That is what explains that radiation can only occur while the bodies are at a particularly high temperature. Next, a group of examples where radiation occurs:
The transmission of electromagnetic waves through the microwave oven.
The heat emitted by a radiator.
Solar ultraviolet radiation, precisely the process that determines the Earth’s temperature.
The light emitted by an incandescent lamp.
The emission of gamma rays by a nucleus.
The processes of heat transmission increase and decrease the temperatures of the affected bodies, but also sometimes (as exemplified by ice) are responsible for the phenomena of phase changes, such as the boiling of water in steam, or the fusion of water in ice. Engineering concentrates many of its efforts to take advantage of this possibility of manipulating the state of bodies through the transmission of heat.
An introductory outline of the Physics of Heat. I created this presentation at Curtin Sarawak Malaysia as a basis for Foundation Physics students and others to edit and expand. A Creative Commons Attribution-Share Alike License.
Examples of Convection
What is convection? The convection is the heat transfer based on the actual motion of the molecules of a substance: here involves a fluid which can be gas or liquid.
The transmission convective heat may occur only in fluids where natural movement (the fluid extracts heat from the hot zone and changes densities) or forced circulation (through a fan the fluid moves), the particles can move transporting the heat without interrupting the physical continuity of the body. Here a series of convection examples:
The heat transfer of a stove.
Hot air balloons, which are held in the air by hot air. If it cools, the balloon immediately begins to fall.
When the water vapor fogs the glass of a bath, by the hot temperature of the water when bathing.
The hand or hair dryer, which transmits heat by forced convection.
The heat transfer generated by the human body when a person is barefoot.
Radiation Examples
What is radiation? The radiation is the heat emitted by a body due to its temperature, in a process that lacks contact between bodies or intermediate fluids transported heat.
The radiation causes a body to be solid or liquid of higher temperature than another, occur immediately transfer heat to each other. The phenomenon is that of the transmission of electromagnetic waves, emitted by bodies at a higher temperature than absolute zero: the higher the temperature, the greater these waves will be.
That is what explains that radiation can only occur while the bodies are at a particularly high temperature. Next, a group of examples where radiation occurs:
The transmission of electromagnetic waves through the microwave oven.
The heat emitted by a radiator.
Solar ultraviolet radiation, precisely the process that determines the Earth’s temperature.
The light emitted by an incandescent lamp.
The emission of gamma rays by a nucleus.
The processes of heat transmission increase and decrease the temperatures of the affected bodies, but also sometimes (as exemplified by ice) are responsible for the phenomena of phase changes, such as the boiling of water in steam, or the fusion of water in ice. Engineering concentrates many of its efforts to take advantage of this possibility of manipulating the state of bodies through the transmission of heat.
An introductory outline of the Physics of Heat. I created this presentation at Curtin Sarawak Malaysia as a basis for Foundation Physics students and others to edit and expand. A Creative Commons Attribution-Share Alike License.
An introductory outline of the Physics of Heat. I created this presentation at Curtin Sarawak Malaysia as a basis for Foundation Physics students and others to edit and expand. Except where otherwise noted, this work is licensed under the Creative Commons Attribution-Share Alike 2.5 Malaysia License.
I wish the person who shared this with me had put their name to the presentation - if it was you, please let me know if you would prefer not to have it on Slideshare.
An introductory outline of the Physics of Heat. I created this presentation at Curtin Sarawak Malaysia as a basis for Foundation Physics students and others to edit and expand. Except where otherwise noted, this work is licensed under the Creative Commons Attribution-Share Alike 2.5 Malaysia License.
I wish the person who shared this with me had put their name to the presentation - if it was you, please let me know if you would prefer not to have it on Slideshare.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
Contact with Dawood Bhai Just call on +92322-6382012 and we'll help you. We'll solve all your problems within 12 to 24 hours and with 101% guarantee and with astrology systematic. If you want to take any personal or professional advice then also you can call us on +92322-6382012 , ONLINE LOVE PROBLEM & Other all types of Daily Life Problem's.Then CALL or WHATSAPP us on +92322-6382012 and Get all these problems solutions here by Amil Baba DAWOOD BANGALI
#vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore#blackmagicformarriage #aamilbaba #kalajadu #kalailam #taweez #wazifaexpert #jadumantar #vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore #blackmagicforlove #blackmagicformarriage #aamilbaba #kalajadu #kalailam #taweez #wazifaexpert #jadumantar #vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore #Amilbabainuk #amilbabainspain #amilbabaindubai #Amilbabainnorway #amilbabainkrachi #amilbabainlahore #amilbabaingujranwalan #amilbabainislamabad
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
2. Why & how teach energy?
In small groups, discuss:
Why and how is energy taught at KS3?
What do students gain from it?
Is this a useful preparation for GCSE & A-level studies?
Jot a few things down so that you can report back.
5 minutes
2
3. It’s easy to go wrong
In what way is each of these statements wrong?
1. ‘The moving pencil uses kinetic energy.’ (QCA)
1. ‘The steam [from a volcano vent] is converted into energy and
transported to Europe via a 1,200-mile sea-floor cable.’ (a London
newspaper)
1. ‘Carbonaceous matter is converted to heat or other forms of
energy.’ (Physics World)
2. ‘Energy makes things happen.’ (ASE Big Ideas)
1. ‘The bulb lights because energy flows from the battery to the bulb.’
(Sophie, Year 9)
3
5. Energy and power
by analogy
time
power
energy
measured in joules, MJ or kWh
time
flow
me
water volu
measured in litres
time
energy
power
measured in joules per second,
W, MW, GW, TW, kWh per day
water
time
volume
flow
measured in litres per minute
6. Energy today
How many Mars bars would I need to climb a mountain?
How much coal/oil do I use in a day?
Will UK electricity production match peak demand?
Can the Sun supply the world’s energy needs?
What is the efficiency of a motor?
How high can a projectile go?
Answering questions like this requires a calculation.
6
7. Learning outcomes
• describe physical processes in terms of energy stores and transfers
• distinguish between temperature and internal energy
• explain thermal transfers (conduction, convection, radiation)
• calculate the specific thermal capacity of metal objects
• discuss energy changes associated with change of state (latent heat)
• explain the law of conservation of energy, calculate efficiency in
energy transfers and recognise dissipation
• relate work done by a force to and
• describe rate of mechanical working as power
• apply energy concepts to decision-making about energy policy
• use a variety of experiments to convey key ideas about energy
Ep = mgh Ek =
mv2
2
8. Teaching challenges
• ‘Energy’, an everyday word, in science is an abstract quantity.
• Energy conservation defies common sense, as everyday
things ‘run out of energy’.
• Simply naming different types of energy, or energy chains,
provides no explanation for physical processes.
• Students find work done (force exerted over a distance) more
difficult than impulse (force exerted over an interval of time).
• Although temperature is a very familiar and tangible property,
it needs to be associated with the random thermal motion of
particles inside a body (internal energy).
9. What is ‘energy’?
‘A certain quantity that does not change’
‘It is not a description of a mechanism, or anything concrete; it
is just a strange fact that we can calculate some number and
when we finish watching nature go through her tricks and
calculate the number again, it is the same.’
Richard Feynman
The law of conservation of energy
10. Energy stores & pathways
Practical Physics guidance notes
• Helpful language for energy talk
• What’s wrong with ‘forms of energy’?
• Does energy make things happen?
12. A circus of energy experiments
Working in pairs, do as many experiments as
you can.
~30 minutes
[please do NOT write on instruction sheets]
13. Mechanical energy
For an object starting from rest,
Work done
Therefore no surprise that, in some mechanical systems,
e.g. roller coaster, or pendulum
W = F ´displacement = F ´(average velocity´time)
W = Ft ´
v
2
= mv(
v
2
) =
mv2
2
impulse = force´time = mv
mgh+
mv2
2
= constant
14. ‘Mechanical equivalent of heat’
Early in 19th C, ‘heat’ was thought to be a fluid, called ‘caloric’.
Many experiments, mainly 1840 – 1900, showed conversions of
heat to/from mechanical or electrical sources, leading to the
concepts of energy & energy conservation.
James Prescott Joule, Manchester brewer & amateur scientist.
40 expts! e.g. Swiss honeymoon: thermometer to measure temperature
of water at top & bottom of a waterfall.
1850 article, Philosophical Transactions (Royal Society)
Clausius, Thomson (Lord Kelvin), Helmholtz, Rankine
T
c
t
m
h
g
t
m
C
kg
J
c o
4200
water,
of
capacity
heat
specific
15. Students often confuse …
Thermal energy (store)
Temperature Heating (pathway)
Average energy per particle
e.g. a sparkler is hot (high
temperature) because each
particle of metal has lots of
energy
e.g. a bath full of water is
not as hot (lower
temperature) because each
particle has less energy.
Directly measurable.
Total energy of the system
Depends on number of particles
in a body and the energy of
each one e.g. a sparkler has
less energy than a bath full of
water because there are many
more particles in a bath.
A process or pathway which
changes the energy store of an
object
15
17. Thermal transfers
Energy transfer from one store to another because of a
temperature difference.
conduction: Ek transferred from atom to atom
convection: bulk movement of a fluid caused by localised
thermal expansion and hence differences of density in the fluid.
radiation: warm body emits a continuous spectrum of
electromagnetic radiation, with peak frequency related to
absolute temperature.
18. Heat capacity
thermal store associated with a temperature
change but no change of state.
Start simple: Why is a bite of hot potato more likely to burn the tongue
than a bite of cabbage at the same temperature? Which foods stay
hot longer on your plate?
Thermal (heat) capacity of an object: energy stored or released by
an object per degree of temperature change, in J oC-1
‘Specific’ thermal capacity: energy stored or released by a kg of
material per degree of temperature change, in J kg-1 oC-1
Materials used as coolants have a high specific thermal capacity.
Table
T
mc
Q
19. Experiments to determine c
• Electrical method
• Method of mixtures e.g. solid placed in water
energy lost by hotter object = energy gained by cooler object
NOTE: Both the equations above assume no heat loss. Insulate
calorimeter & include it in calculations.
• Using a cooling curve
ref: Nelkon & Parker Advanced level Physics
Practical Physics Energy collection ‘Thermal physics’
T
mc
IVt
object
by
gained
energy
supplied
energy
electrical
temp
m
equilibriu
the
is
where
,
)
(
)
( 3
2
3
2
2
1
3
1
1
T
T
T
c
m
T
T
c
m
20. Latent heat
thermal store associated with a change of state
but no temperature change.
Term ‘latent’ introduced ~1750 by Joseph Black [derived
from the Latin latere, to lie hidden].
Fusion: reversible change solid to liquid
Vaporisation: reversible change liquid to vapour
Table
heat
latent
specific
mass
Q
21. Cooling or heating curves
previously schools used naphthalene (now hexadecanol)
23. Latent heat
Experiments
• Fusion: Melting ice in a calorimeter
• Vapourisation: passing steam through a calorimeter;
electrical method.
References: Nelkon & Parker Advanced level Physics,
Practical Physics Energy collection ‘Thermal physics’
Applications releasing energy as liquid changes to solid
• hot pad hand-warmer
• thermal energy storage in buildings
24. UK Energy futures
David MacKay, Sustainable energy – without the hot
air
Concerns about UK energy policy:
• Fossil fuels are a finite resource
• Security of energy supply
– for the UK population and the economy
– not reliant on foreign energy sources
– diversified sources mean more robust
• CO2 and climate change
‘Numbers, not adjectives’
25. A balance sheet
Energy consumed Energy produced
Cars Wind
Planes Solar
Heating and cooling Hydroelectricity
Lighting Offshore wind
Gadgets Waves
Food and farming Tide
Stuff – materials from cradle to grave Geothermal
Public services Fossil fuels - coal, oil and gas
Energy industries Nuclear
26. Ben Goldacre, Bad science
12 December 2009
Climate change? Well, we’ll be dead by then
‘Zombie arguments survive, immortal and
resistant to all refutation, because they do not
live or die by the normal standards of mortal
argument.’
27. In the science classroom?
Carefully structured discussions to develop skill in
policy-related argument, based on
• science, if possible including quantitative estimates
• social values
• a basic understanding of how collective (social,
political and economic) decisions are made in the UK
… simplifying the breadth and depth of science to
match pupils’ age and ability
28. Useful websites
Climateprediction.net follow links Support -> Schools
Realclimate.org climate scientists’ blog and archive
Google Earth v5 time series images show impact of climate change
UK Energy Flows comprehensive Sankey diagram published
every 3 years
The Guardian pages on Climate change - plus related
Environment pages … and weblinks
29. Support, references
www.talkphysics.org
SEP Energy now! cdrom, 3 booklets Energy storage,
Solar power, Wind power
Energy topic, Practical Physics website, including Guidance pages
David Sang (ed, 2011) Teaching secondary physics ASE / Hodder