specific heat capacity is the amount of energy needed to change the temperature of 1kg of the substance by 1C
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Define latent heat of fusion
specific latent heat of fusion is the energy needed to melt 1kg of a substance with no change in temperature.
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What is conduction?
conduction is the energy in a metal is caused mainly by free electrons transferring energy inside the metal.
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what is convection
convection is the circulation of a fluid caused by heating it, convection currents transfer energy from the hotter parts to the cooler parts.
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what happens when a liquid is cooled?
when a liquid is cooled the particles with more kinetic energy break away from the attraction of the other particles at the surface and escape from the liquid.
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name the three factors effecting the rate of evaporation
large surface area, increase temperature and increase of draught air across liquid
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what is infrared radiation?
infrared radiation is energy transfer by electromagnetic waves, the higher the temperature of an object, the more infrared radiation it emits
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name four parts of the electromagnetic spectrum
Radio waves, infrared radiation, micro waves and visible light
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What surfaces repel infrared radiation and which surfaces attract
repel- shiny light surfaces that 'mirror' infrared surfaces, attract- dark matt surfaces
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what is expansion by heating?
the expansion of a substance due to increasing its temperature
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why do buildings need expansion gaps?
Because when temperatures increase metals expand and need space to expand other wise they will buckle
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Give an example of expansion
thermometer, makes use of expansion of liquids, when the liquid in the bulbs warms, it expands and rises up the tube
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What does an ammeter measure?
the measure of electric current
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What does a volt meter measure
a volt meter measure the potential difference
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What is a direct current?
a current going in one direction only
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What in and alternating current?
a current going reversible directions
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What is an oscilloscope?
an oscilloscope is used to measure the alternating potential difference changes with time
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in a plug, what colour is the live wire?
brown
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what is the colour of the neutral wire?
blue
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what is the colour of the earth wire?
green and yellow
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What is a circuit breaker?
a circuit breaker is an electromsgnetic switch that opens and breaks the circuit if too much current is passing through.
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what makes up a fuse?
a thin wire that heats up and melts if too much current is passed through
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How do you calculate power?
power= current times potential difference
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What is potential difference measured in?
volts
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Other cards in this set
Card 2
Front
Define latent heat of fusion
Back
specific latent heat of fusion is the energy needed to melt 1kg of a substance with no change in temperature.
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