Energy Transfer Powerpoint (P1.1)

A presentation I made for personal use, but that I thought might be useful for some of you. I apologise if any of the notes are brief; originally they were only meant for my use, but hope it helps you with your revision :)

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Slide 1

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Physics: P1
Energy Transfer…read more

Slide 2

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Infrared Radiation
· Involves the transfer of heat energy by
electromagnetic radiation.
· No particles of matter are involved.
· All objects emit and absorb infrared radiation (IR).
· The hotter an object is, the more IR it emits.
· The amount of radiation an object emits or absorbs
depends on surface, shape and dimensions.
· Different materials transfer energy at different rates.
· Dark, matt surfaces emit and absorb more IR than
light, shiny surfaces which are good reflectors of IR.…read more

Slide 3

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Kinetic Theory
· Explains different states and
properties of matter in terms of the
movement of particles.
· Particles of gases, liquids and solids
have different amounts of energy.
· In gases, particles move very quickly
in random directions, colliding with
each other.
· Increased temperature makes them
move faster.
· Decreased temperature makes the
particles move slower, come closer
together and start to form a liquid.
· Eventually it becomes a solid; the
particles now only move/vibrate in a
fixed position. They are all in an
orderly pattern.…read more

Slide 4

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· The transfer of heat energy
without the substance
· Metals are good
conductors; as the metal
heats the particles vibrate
more vigorously.
· The additional energy is
transferred to the cooler
areas of the metal by free
· Insulators have few/no free
electrons so can't transfer
heat energy easily.…read more

Slide 5

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· The transfer of heat energy
through the movement of
· Occurs in liquids and gases,
creating convection currents.
· Particles nearest the energy
source move faster; the
substance becomes less
· The warm substance rises,
becoming cooler. It becomes
denser and eventually sinks.
· The denser substance moves
into the space near the heat
source and the cycle repeats.…read more

Slide 6

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Evaporation and Condensation
· Evaporation is the
transfer of energy at a
liquid's surface.
· Atoms at the surface
move more quickly
and escape as a gas.
· When water
evaporates, it becomes
water vapour.
· The opposite is
condensation ­ when
a gas returns to a
liquid state.…read more

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