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GCSE level physics exam revision notes
on thermal energy 1
Part 1.1
What is a thermal energy store? Introduction
to thermal energy and kinetic energy particle model of the three states of
matter in terms of thermal energy
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INDEX for physics notes on thermal
energy transfer by conduction, convection and radiation
1.1 Introduction
to thermal energy ('heat energy') transfer
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Thermal energy is the energy contained in a system of
particles due to their kinetic energy of vibration or movement from place to
place.
-
Energy can be transferred
from one place to another by work or by heating processes.
-
You need to know
and understand how this
energy is transferred and which heating processes are most important in a
particular situation.
-
When energy is transferred to an
object by some means or other, the energy is stored in the object's energy
store.
-
This energy store may be thermal (dealt with here), chemical,
kinetic, magnetic, gravitational potential, elastic potential or nuclear.
-
Here we are interested in energy
transfer by heating (conduction, convection) and infrared (radiation).
-
Heat energy must always flow
from hotter material at a higher temperature to cooler material at a lower
temperature and the bigger the temperature difference the bigger the rate of
heat energy transfer.
-
eg the greater the temperature
difference between a body and its surroundings like a hot object like a mug of
coffee standing in a cold room, the faster the heat energy is transferred
from the hotter material to the cooler material (eg surrounding air).
-
Systems, thermal energy stores and
states of matter
KE of particle movement from place to place in
gases |
KE of particle movement
from place to place in liquids |
KE of particle vibration
in the same place in solids |
-
System is a word that means a particular
object or objects that is being looked at in a particular context eg boiling
water in a kettle.
-
When a system changes, energy is
transferred into or out of the system, this may be between different
objects/materials in the system or perhaps between different energy stores
(same of different).
-
Closed systems are systems that do not
allow energy to leave or enter (lose or gain) so the ne change in the total
energy is zero.
-
When an object/material is heated to
raise its temperature, the thermal energy store of the object is increased.
-
This thermal energy is stored throughout
all the material by increasing the kinetic energy (KE) stores of the
material's individual particles eg the KE particle vibration in a solid and
the KE of the rapid movement of the freely moving particles in a liquid or
gas.
-
The thermal KE is distributed by either
the particles vibrating against each other in a solid or the collisions
between the freely moving particles in a gas or liquid. Higher KE particles
will on average lose energy to lower KE particles - that's the way energy
'flows'.
-
The higher the temperature of particles
the greater their average kinetic energy so they will vibrate more violently
in a solid and move faster in gases and liquids.
-
Once heat energy has stopped being
supplied to an object, it will distribute itself evenly to give a uniform
temperature throughout the material by conduction or convection. However, if
object's/material's surroundings are at a lower temperature, then heat
energy will drain from this thermal store until its temperature has fallen
to that of the surroundings - that's the way heat flows!
-
-
-
The amount of thermal energy transferred
can be calculated from the formula
-
energy transferred (J) = mass (kg) x
specific heat capacity (J/kgoC) x temperature change (oC)
-
For more details of calculations see
See also
Specific heat capacity: How to determine it, use of data,
calculations and thermal energy stores
Particle theory models, internal
energy, heat transfer in state changes,
latent heat, particle motion
Notes on thermal
energy transfer by conduction, convection, radiation
Key points
Thermal energy transfer: What is a thermal energy store?
Information
sources for Doc Brown's key points: IGCSE-GCSE physics are based on
textbooks & syllabus-specifications for students taking the UK AQA, Edexcel,
OCR 21st Century Science, OCR Gateway science suite, WJEC, CCEA and CIE GCSE
physics 9-1 level science examinations
Here's a structured set of summary revision notes on
thermal energy stores,
tailored to the major UK GCSE/IGCSE physics exam boards: WJEC, CCEA,
CIE, AQA, Edexcel, and OCR.
What Is a Thermal Energy Store?
- A thermal energy store
refers to the energy contained within an object due to the movement
of its particles.
- It is part of the internal energy
of a substance, which includes:
- Kinetic energy
of particles (due to their motion)
- Potential energy
from intermolecular forces
Typical Core Academic Content Across Exam
Boards about thermal energy stores
| Concept |
Description |
| Definition |
Energy stored in a warm object due to
particle motion |
| Energy Transfer Pathways |
Heating, electrical work, mechanical
work, radiation |
| Specific Heat Capacity (SHC) |
Amount of energy needed to raise 1 kg
of a substance by 1°C |
| Equation |
ΔE = m × c × Δθ (change in thermal
energy) |
| Units |
Energy (J), mass (kg), SHC (J/kg°C),
temperature change (°C) |
| Examples |
Heating water in a kettle, brake pads
warming during friction |
| Energy Dissipation |
Some thermal energy is lost to
surroundings as waste heat |
All boards (AQA, Edexcel, OCR, WJEC, CCEA,
CIE) include this concept under energy stores and transfers,
often in the P1 or Energy topic.
Student Tips about thermal energy stores
- Link concepts:
Always connect thermal energy to particle motion and temperature changes.
- Use diagrams:
Particle models help visualize how heating affects solids, liquids, and
gases.
- Practice calculations:
SHC problems are common - memorize the formula and units.
- Think real-world:
Use examples like kettles, radiators, and brakes to anchor your
understanding.
- Revise energy pathways:
Know how energy moves between stores - especially via heating.
Common Misconceptions about thermal energy
stores
- “Heat is energy”:
Heat is a transfer of energy, not a store. The store is
thermal energy.
- “Temperature = thermal energy”:
Temperature measures average particle kinetic energy, not total energy.
- Confusing SHC with thermal
conductivity: SHC is about
storing energy; conductivity is about transferring it.
- Ignoring mass in SHC calculations:
Mass directly affects how much energy is stored - don’t overlook it!
Keywords, phrases and learning objectives for a
thermal energy store and particle
models
Know what me mean by a thermal energy store.
Be able to explain that a thermal energy store can
be described using a kinetic energy particle model of the three
states of matter - gas, liquid or solid.
-
Check out your
practical work you did with thermal energy you did or teacher demonstrations you observed in all of this is part of good revision for your
module examination context questions and helps with 'how science works'.
-
Passing white light through a
prism and detecting the infrared radiation with a thermometer.
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Demonstration using balls in a
tray to show the behaviour of particles in substances in different states
i.e. gas, liquid and solid.
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Measuring the cooling effect
produced by evaporation by putting wet cotton wool over the bulb of a
thermometer or temperature probe.
-
Plan and carry out an
investigation into factors that affect the rate of cooling of a can of
water, eg shape, volume, and colour of can using Leslie’s cube to
demonstrate the effect on radiation of altering the nature of the surface.
-
Investigating thermal conduction
using rods of different materials.
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energy transfer
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energy store is
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for gas, liquid & solid kinetic particle model of a thermal energy store, revision notes about
gas, liquid & solid kinetic particle model of a thermal energy store, what do I need to learn about
gas, liquid & solid kinetic particle model of a thermal energy store for
by GCSE physics exam?
help to understand the gas, liquid & solid kinetic particle model of a
thermal energy store topic in preparation for GCSE physics exam
question, how to
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Notes on thermal
energy transfer by conduction, convection, radiation
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