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Energy (energy stores and systems (system= a single or group of objects…
Energy
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specific heat capacity
more energy needs to be transferred to the thermal energy store of some materials to increase their temperature than others.
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practical:
measure mass of a block and initial temperature then wrap in newspaper. Then turn power supply on and heat block for 10 mins taking the blocks temp every 1 minute.
efficiency
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we can improve efficiency by= lubricating, insulating and making objects more streamlined
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wind, solar, geothermal
wind
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cons:
-spoil views
-need 1500 turbines to replace one coal fired power station
-noisy
-turbines stop when wind is too high or low
-produce energy only 70-85% of time
-initial costs are high
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geothermal
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cons:
-not many suitable locations
-cost of building power plant is high
-doesn't produce huge amounts of energy
hydro electricity, waves and tides
hydro electricty
pros:
-no pollution
-provide immediate response to an increased energy demand
-minimal running costs
-reliable
cons:
-big environmental impact: loss of habitat, causes vegetation to rot
-ugly
-initial costs are high
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tidal barrages
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cons:
-prevent access for boats
-spoil view
-alter habitats
-varying height of waves (big waves provide more energy)
-initial costs are moderately high
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