Evaluate Device Energy Efficiency
Physics · Flashcards · Application
PHYSICS · FLASHCARDS
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QUESTION
What is the percentage efficiency if
P
useful
=
18
W
P_\text{useful}=18\,\text{W}
P
useful
=
18
W
and
P
input
=
24
W
P_\text{input}=24\,\text{W}
P
input
=
24
W
?
QUESTION
What is the percentage efficiency if
E
useful
=
60
J
E_\text{useful}=60\,\text{J}
E
useful
=
60
J
and
E
input
=
80
J
E_\text{input}=80\,\text{J}
E
input
=
80
J
?
QUESTION
Identify the more efficient device: A has
%
efficiency
=
85
%
\%\text{ efficiency}=85\%
%
efficiency
=
85%
, B has
%
efficiency
=
0.90
×
100
%
\%\text{ efficiency}=0.90\times 100\%
%
efficiency
=
0.90
×
100%
.
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ANSWER
Device B. B has 90% efficiency, higher than A's 85%.
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