Test Device Performance
Middle School Science · Flashcards · Application
MIDDLE SCHOOL SCIENCE · FLASHCARDS
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QUESTION
Calculate thermal energy gained:
m
=
0.50
kg
m=0.50\ \text{kg}
m
=
0.50
kg
,
c
=
4200
J/(kg
⋅
∘
C)
c=4200\ \text{J/(kg}\cdot^\circ\text{C)}
c
=
4200
J/(kg
⋅
∘
C)
,
Δ
T
=
2
∘
C
\Delta T=2^\circ\text{C}
Δ
T
=
2
∘
C
.
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.
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ANSWER
Device B. Higher efficiency means less energy wasted.
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