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Cards (19)
What can energy be transferred into?
Different
forms of energy
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Why are most devices not 100% efficient?
They lose energy in
non-useful
forms
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What is efficiency in terms of energy output?
Proportion of
input energy
converted to
useful output
Useful energy output vs.
total energy
input
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What is the useful energy output of a lamp?
Light energy
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How is heat energy classified in a lamp's output?
As
waste energy
or
non-useful energy
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What is the formula for calculating efficiency?
Efficiency =
useful
energy
output
/
total
energy
input
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How can efficiency be calculated in terms of power?
Efficiency =
useful power output
/
total power input
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If a lamp has an input of 300 joules and outputs 45 joules of light, what is its efficiency?
0.15
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If a lamp has an input of 300 joules and outputs 225 joules of light, what is its efficiency?
0.75
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How many times more efficient is the LED lamp compared to the incandescent bulb?
5
times
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How do you convert efficiency from decimal to percentage?
Multiply
by 100
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What is a common mistake when calculating efficiency?
Getting the
division
the wrong way around
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What happens if you calculate efficiency incorrectly and get a value over 1?
It implies more
energy output
than
input
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What principle states that energy can only be transferred?
Conservation of energy
principle
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If a microwave is 70% efficient with a total power input of 800 watts, what is the useful power output?
560 watts
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What is the relationship between efficiency and waste energy?
No device is
100%
efficient
All devices produce waste energy
Thermal energy
is a common waste form
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What is an exception to the rule of devices not being 100% efficient?
Devices designed to
produce
heat
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What type of energy do electric heaters produce?
Thermal energy
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How is thermal waste energy classified in heating devices?
As
useful output
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