Physics
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- Created by: Kinza
- Created on: 05-05-13 15:06
what are the 9 forms of energy?
kinetic, nuclear, elastic, sound, heat, gravitational, light, electrical and chemical
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what is the equation for efficiency?
useful energy out / total energy in
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where does conduction happen?
in solids and not so well in liquids
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where does convection occur?
in liquidsd and gases
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what happens to the air in covection befroe it rises?
gets less dense
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what happens to air air as it gets denser in convetion?
sinks
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how can heat be transferred through empty space?
infrared radiation
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what do all hot or warm objects give off?
it gives off or emit radiation.
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what two things can be done to infrared radiation?
absorbed or reflected.
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what does seating do?
cools you down
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how is the speed of particles moving related to the temparature?
the faster the particles, the hotter it is
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how is enegy and no of particles related?
the more the particles the more the energy
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what are the 3 types of heat ransfer?
convection, radiation, and conduction.
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what is the opposite of conduction?
insulation
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what is temperature?
the average speed of the moving particles
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give an example of poor conductors
wood, plastic, glass
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what are U-values?
measures the rate of energy transfer through a material.
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how much is 1 watt in Joules?
1 watt = 1 joule per second
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what is the equation for payback time?
payback time = cost / saving
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what is the tirangle for specific heat capacity?
e / m x c x shc
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what is the equation for power (watts)?
power = amps x volts
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what is the equation for power?
power = energy/time
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how many watts is in 1 Kw?
1000watts
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what is Kwh?
Kw x hours
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how much is 1 unit of electricity in Kwh?
1 unit of electricty is 1 Kwh
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what is the equation for finding the cost of electricity?
number of units x cost per unit
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what is the the advantages and disadvantages of using coal?
Advantages: cheap, easy to transport, Disadvantages: non-renewable, produces CO2
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what is the the advantages and disadvantages of using oil?
Advantages: easy to transport, Disadvantages: can spill, run out
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what is the the advantages and disadvantages of using gas?
Advantages: easy to transport, Disadvantages: highly explosive
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what is the the advantages and disadvantages of using wood chip?
Advantages: renewable, carbon neutral Disadvantages: deforestation, hard to transport
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what is the the advantages and disadvantages of using nuclear?
Advantages: lots of atoms, carbon neutral Disadvantages: nuclear waste is left which is still radioactive
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how does a fossil fuel power station work?
boiler - the steam turnes the turbines which generates electricity in the generator which goes into the transformer which goes into the pylons
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how does a nuclear power station work?
fuel rods, boiler which creates steem which turns the turbines which generates electricity which goes to the transformer which goes into the pylons?
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what is the equation for power loss?
current squared x resistance
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what is the Natinal Grid?
network of cables and transformers that links power stations to consumer.
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what does a step-up tranformer do?
increases the voltage
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whay are step-up transformers used?
to make the current lower so there is less power loss.
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name 2 renewable sources of energy?
wind, waves
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what is the name of the proceszs by which a nucler fuel produces heat?
nuclear fission
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Other cards in this set
Card 2
Front
what is the equation for efficiency?
Back
useful energy out / total energy in
Card 3
Front
where does conduction happen?
Back
Card 4
Front
where does convection occur?
Back
Card 5
Front
what happens to the air in covection befroe it rises?
Back
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