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Physics
P1
Efficiency
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Cards (13)
What does efficiency tell us about energy transfer?
Fraction
of energy converted to
useful forms
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What is the equation for efficiency?
Efficiency =
useful output
/ total input
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What is another equation for efficiency involving power?
Efficiency =
useful power output
/ total power input
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How can efficiency be expressed as a percentage?
Multiply
decimal
efficiency by 100
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What happens if you calculate efficiency upside down?
You get a value
greater than 1
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Why are LED bulbs considered more efficient?
More energy is
converted
to light
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What are ways to increase the efficiency of energy transfer?
Use a pan with a wider base
Use a lid on the pan
Place heating element inside water
Use materials with lower
thermal conductivity
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What happens to thermal energy when using a pan to heat water?
Some
energy
is
wasted
to the
air
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How does a kettle improve efficiency compared to a pan?
Heating element
is inside the water
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Why is metal less efficient than plastic for heat transfer?
Metal conducts
heat
better
than
plastic
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What is the significance of thermal conductivity in energy transfer?
It
affects
how much
energy
is
wasted
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How does using a lid on a pan affect energy transfer efficiency?
It reduces unwanted
thermal energy loss
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What is the role of a wider base on a pan in energy transfer?
It reduces
unwanted
thermal energy
loss
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