Resistance, Resistivity, and Ohm's Law
AP Physics 2 · Flashcards · Application
AP PHYSICS 2 · FLASHCARDS
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QUESTION
Calculate the power if
I
=
5
A
I = 5\text{A}
I
=
5
A
and
V
=
12
V
V = 12\text{V}
V
=
12
V
.
QUESTION
Calculate the current if
V
=
12
V
V = 12\text{V}
V
=
12
V
and
R
=
4
Ω
R = 4\text{Ω}
R
=
4
Ω
.
QUESTION
Find
R
R
R
if
P
=
100
W
P = 100\text{W}
P
=
100
W
and
I
=
10
A
I = 10\text{A}
I
=
10
A
.
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ANSWER
R
=
1
Ω
R = 1\text{Ω}
R
=
1
Ω
. Using
P
=
I
2
R
P = I^2R
P
=
I
2
R
, so
R
=
P
I
2
=
100
100
=
1
Ω
R = \frac{P}{I^2} = \frac{100}{100} = 1\text{Ω}
R
=
I
2
P
=
100
100
=
1
Ω
.
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