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Cards (20)
What is the concept of
energy transfer
discussed in the material?
Energy
can be transferred from one form into another form.
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Why is
energy
not always transferred into the intended form?
Most devices aren't
100%
efficient.
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What is
efficiency
in the context of energy transfer?
Efficiency is the proportion of
input
energy that is converted into useful
output
energy.
It is calculated as:
Efficiency =
Useful Energy Output
/
Total Energy Input
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How do you calculate the
efficiency
of a device in terms of
power
?
Efficiency =
Useful Power Output
/
Total Power Input
.
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What type of energy does a lamp convert its input energy into?
A lamp converts
electrical energy
into
light energy
and
heat energy
.
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How is
light energy
classified in the context of a lamp's output?
Light energy is considered
useful energy output
.
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How is
heat energy
classified in the context of a lamp's output?
Heat energy is classified as
waste energy
or non-useful energy output.
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If a lamp has an
input energy
of
300
joules and outputs
45
joules of light energy, what is its
efficiency
?
The efficiency is
0.15
0.15
0.15
.
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If a lamp has an
input energy
of
300
joules and outputs
225
joules of light energy, what is its
efficiency
?
The efficiency is
0.75
0.75
0.75
.
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How many times more
efficient
is the
LED lamp
compared to the
incandescent bulb
?
The LED lamp is
5
times more efficient.
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How do you convert
efficiency
from
decimal
to
percentage
?
You multiply the decimal by
100
.
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What is a common mistake when calculating
efficiency
?
A common mistake is getting the
division
the wrong way around.
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What happens if you calculate
efficiency
incorrectly and get a value greater than 1?
It implies that more
energy
is
output
than
input
, which is impossible.
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What
principle
explains why energy cannot be created or destroyed?
The
conservation of energy
principle.
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If a microwave has an
efficiency
of
70%
and a total power input of
800 watts
, what is the
useful power output
?
The useful power output is
560
watts
560 \text{ watts}
560
watts
.
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What is the relationship between
waste energy
and devices designed to produce heat?
Most devices produce waste energy, often
thermal
.
Devices like
electric heaters
produce thermal energy as their main function, making it useful output.
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The
concept
of
efficiency
can be applied to individuals, organizations or systems.
Allocative efficiency
occurs when resources are allocated in a way that maximizes overall
societal welfare
.
Productive efficiency
is achieved when
goods and services
are produced at the lowest possible cost.
Efficiency
=
Useful Work Done
/
Energy Supplied
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