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Physics
Physics
Problem
Which of the following expressions gives the electrical power dissipated by a resistor of resistance
R
R
R
carrying a current
I
I
I
? a)
P
=
2
I
2
R
P = 2 I^{2}R
P
=
2
I
2
R
b)
P
=
I
2
R
P = I^{2}R
P
=
I
2
R
c)
P
=
1
2
I
2
R
P = \dfrac{1}{2} I^{2}R
P
=
2
1
I
2
R
d)
P
=
I
2
R
2
P = \dfrac{I^{2}R}{\sqrt{2}}
P
=
2
I
2
R
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