Energy transfers and efficiency

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Conservation of energy
energy cannot be created or destroyed
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Investigating energy changes- Pendulum
the energy of a swinging pendulum changes from gpe to kinetic energy when it swings.
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Energy stores
elastic energy, gravitational potential energy, light, sound, kinetic, electrical, chemical and nuclear.
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Useful energy
is energy in the place we want it and the form we need it
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Wasted energy
is energy that is not useful energy
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What happens to wasted energy?
its is eventually transferred to the surroundings, which become warmer. This also happens to useful energy.
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what happens to energy when it dissipates?
dissipates= spread out. The energy gets less and less useful
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Sankey diagram
represents the energy flow through a system. it shows useful and wasteful energy.
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Why machines waste energy?
Friction, resistance, air resistance and sound.
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How to reduce this problem?
lubrication, wires with little resistance, streamline objects, cut out noise- tighten loose parts.
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The rate of energy transfers to or from our homes can be reduced by..
loft insulation, cavity wall insulation, double glazing, draught proofing and aluminium foils behind radiators.
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The U-value of a materia
how much energy per second passes through it. The lower the u-value the better the insulator
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solar heating pannel?
sun radiation heats water. Cheap to run but expensive to buy.
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Payback time?
the time taken to recover the cost of buying and installing the device from the savings on the energy bills.
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Other cards in this set

Card 2

Front

the energy of a swinging pendulum changes from gpe to kinetic energy when it swings.

Back

Investigating energy changes- Pendulum

Card 3

Front

elastic energy, gravitational potential energy, light, sound, kinetic, electrical, chemical and nuclear.

Back

Preview of the back of card 3

Card 4

Front

is energy in the place we want it and the form we need it

Back

Preview of the back of card 4

Card 5

Front

is energy that is not useful energy

Back

Preview of the back of card 5
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