Energy Flashcards
Name all 8 Energy?
> Thermal, Kinetic, Gravitational, Magnetic,
Electrostatic, Nuclear, Elastic potential, Chemical.
How is energy trasnfered?
Mechanically,Electrically,or by heating/radiation
What is a closed system?
Closed systems are systems where neither matter nor energy can enter/leave.
What happens when a system changes?
Energy is transferred into or away from the system, between different objects in the system.
What is Work Done?
Whenever energy is transferred from one store to another.
What is the formula for Work Done?
Work Done (J) = Force (N) x Distance (m)
What is the formula for Kinetic Energy
Ek = 0.5 X m x V^2
What is G.P.E?
The energy stored in an object due to its position above the Earth’s surface, this is due to the force of gravity acting on an object.
What is the formula for G.P.E?
Ep = M X g X h
What is E.P.E?
When we stretch a spring were applying force to change the length of the spring.
What is the formula for E.P.E?
Ee = 0.5 X k X e^2
What is the rule of Energy?
Energy can be transferred useful, stored or dissipated, but can never be created or destroyed.
Formula for Power?
Power = Energy transferred/Work Done
————————————————
Time (s)
What is Conduction?
The process where vibrating particles transfer energy to neighboruing particles.
What is Convection?
> Where energetic particles move away from hotter to cooler regions.
Explain how to reduce energy loss?
> Thick walls- reduce heat loss by conduction (Low thermal conductivity).
Cavity walls- reduce conduction
Windows - Single/double glazing
Double glazing is 2 layers of glass so reduced conduction.
Single glazing heat is lost easily by conduction.
What is the formulae for Efficiency?
Useful output energy transfer
Efficiency= ———————————————-
Total input energy transfer
Pros and Cons of wind turbines?
Pros:
>Renewable
Cons:
>Takes a lot of space
>Expensive
>Dependent on strength of the wind
>If wind is too strong it can break.
Pros and Cons of Solar Power?
Pros:
>Low running costs
>Doesn’t produce any harmful pollutants.
Cons:
>Dependent on weather
>High upfront cost
>Produces pollutants while making them
>No way to increase demand of supply
>Takes up a lot of space.
Pros and Cons of geothermal
Pros:
>Renewable energy
>Doesn’t release any pollutants
Cons:
>Expensive
>Only works in volcanic regions
Pros and Cons of Biofuels?
Pros:
>Cheap to make
>Renewable
>Easy to transport
Cons:
>Need somewhere to grow all plants
>Damages environment for space
>Requires energy for harvesting and transport so more CO2 released.
Pros and Cons of Hydroelectric?
Pros:
>Provides an immediate response to an increased demand for electricity.
>Reliable except in droughts
>No fuel costs and running costs
>Useful to generate electricity on a small scale.
Cons:
>Big impact on environment
>Loss of habitat
>Rotting vegetation releases methane
>High initial costs
Pros and Cons of Wave Power?
Pros:
>No pollution
>No fuel costs
>No running costs
>Can be useful on small islands
Cons:
>Disturbs the sea bed and habitats
>Spoils the view and hazardous to boats
>Fairly unreliable waves tend to die when wind drops
>Costs are high
Pros and Cons of Tidal barrages?
Pros:
>No pollution
>Reliable
>No fuel costs
>No running Costs
>Produces significant amount of energy
Cons:
Prevents access of boats spoils the view
>Don’t work when water levels are same on both sides
>High Costs
