energy transfer
DESCRIPTION
O level physicsTRANSCRIPT
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Energy basics
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Temperature and Heat Temperature and heat are NOT THE SAME.
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Temperature How hot or cold it is.
Measured in degrees Celsius.
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Heat The amount of thermal energy, measured in joules or J. A cup of hot tea has heat energy in the form of kinetic energy from its particles.
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A swimming pool at 30C is at a lower temperature than a cup of tea at 80C.BUTthe swimming pool contains more water, so it stores more thermal energy or heat.
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The small beaker of water boils first The large beaker contains more water and needs more thermal energy or heat to reach 100C.
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Chemical energy stored in it is transferred to the surroundings as thermal energy, sound energy and kinetic energy.
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Sound energy can be transferred to your eardrum as kinetic energy (movement energy).
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The battery transfers stored chemical energy as electrical energy. The electrical energy is transferred to the surroundings by the lamp as light energy and thermal energy (heat energy).
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Energy transfer
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The Law of Conservation of Energy Energy is always conserved, it is never "lost" or "wasted.
Some energy transfers are useful and some are not.
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Sankey diagrams