P1.1 The transfer of energy by heating processes and the factors that affect the rate at which the energy is transferred
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- Created on: 30-04-17 13:27
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- The transfer of energy by heating processes and the factors that affect the rate at which the energy is transferred
- Transferred in 3 different ways
- Radiation: Heat radiation is the transfer of heat energy by IR radiation
- IR can be emitted and absorbed by any state
- Conduction: Transfer of energy by particles
- Main form of heat transfer in solids
- Convection: Transfer of energy by particles
- Main form of heat transfer in liquids and gases
- The BIGGER the temperature difference between a body and its surroundings, the FASTER energy is transferred by heating
- Radiation: Heat radiation is the transfer of heat energy by IR radiation
- Radiation
- An object that is hotter than its surroundings emits more radiation than it absorbs - if the object is cooler it absorbs more.
- Dark ,matt surfaces absorb and emit more than light ,shiny surfaces
- Light ,shiny surfaces reflect more than dark ,matt surfaces
- Conduction
- The process where vibrating particles pass on their extra kinetic energy to neighbouring particles
- Therefore conduction is faster in denser solids as particles are closer together so will collide more often
- The process where vibrating particles pass on their extra kinetic energy to neighbouring particles
- Convection
- When the more energetic particles move from the hotter region to the cooler region and take their heat with them
- All about changes in density
- Immersion Heater...
- Radiator...
- Condensation and Evaporation
- Condensation is when gas turns to liquid
- Faster if: temperature of gas is lower, temperature of the surface is lower, density is higher, airflow is less
- Evaporation is when liquid turns to gas
- Faster if: temperature is higher, density is lower, surface area is larger, airflow is greater
- Condensation is when gas turns to liquid
- Limiting heat transfer
- Vacuum Flask...
- Humans and animals...
- Energy efficiency in the home...
- Specific Heat Capacity
- How much energy as substance can store
- E = m x c x beta
- Conservation of Energy
- Energy can be transferred usefully from one form to another, stored or dissipated - but it can never be created or destroyed
- Energy
- Electrical -whenever a current flows
- Light - from the Sun, lightbulbs etc.
- Sound - from loudspeakers or anything noisy
- Kinetic - anything moving
- Nuclear - released from nuclear reactions
- Thermal - hot objects to colder ones
- GPE - anything which can fall
- EPE - stretched springs, elastic etc.
- Chemical - foods, fuels , batteries etc.
- Transferred in 3 different ways
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