Test Device Performance
Middle School Physical Science · Flashcards
MIDDLE SCHOOL PHYSICAL SCIENCE · FLASHCARDS
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QUESTION
Calculate electrical energy input for
P
=
200
W
P=200\,\text{W}
P
=
200
W
operating for
t
=
180
s
t=180\,\text{s}
t
=
180
s
.
QUESTION
Identify the better device by efficiency: A is
30
%
30\%
30%
efficient, B is
45
%
45\%
45%
efficient.
QUESTION
What is the meaning of
Δ
T
\Delta T
Δ
T
in
Q
=
m
c
Δ
T
Q=mc\Delta T
Q
=
m
c
Δ
T
?
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ANSWER
Δ
T
=
T
final
−
T
initial
\Delta T=T_{\text{final}}-T_{\text{initial}}
Δ
T
=
T
final
−
T
initial
. Delta T represents the change in temperature from start to finish.
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