1132223
Description
Mind Map by killthemoment, updated more than 1 year ago
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Created by killthemoment
over 10 years ago
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P1.2 Energy And Efficiency
- P1.2.1 Energy Transfers And Efficiency
- Appliances transfer energy but they rarely transfer all of the
energy to the place we want. We need to know the efficiency of
appliances so that we can choose between them, including how
cost effective they are, and try to improve them.
- Energy can be transferred usefully, stored, or dissipated, but
cannot be created or destroyed.
- When energy is
transferred only part
of it may be usefully
transferred, the rest is
'wasted'.
- Wasted energy is eventually
transferred to the surroundings,
which become warmer. The wasted
energy becomes increasingly spread
out and so becomes less useful.
- To calculate the efficiency of a device use the following
equations: efficiency=useful energy out/total energy in
(x100%) or efficiency=useful power out/total power in
(x100%).
- To calculate the efficiency of a device use the following
equations: efficiency=useful energy out/total energy in
(x100%) or efficiency=useful power out/total power in
(x100%).
- Wasted energy is eventually
transferred to the surroundings,
which become warmer. The wasted
energy becomes increasingly spread
out and so becomes less useful.
- When energy is
transferred only part
of it may be usefully
transferred, the rest is
'wasted'.
- Energy can be transferred usefully, stored, or dissipated, but
cannot be created or destroyed.
- Appliances transfer energy but they rarely transfer all of the
energy to the place we want. We need to know the efficiency of
appliances so that we can choose between them, including how
cost effective they are, and try to improve them.
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