Question

Question #b9556

Answer 1

`P=I*V = (0.400 A)(12.0 V) = 4.80` watts

Explanation:

Withe the information you have, you could also use

`P=I^2R` or `P=V^2/R`

all will yield the same result.

Answer 2

`4.8 W`

Explanation:

`P=V xx I` where `V=12.0` and `I=0.400`. `12.0 xx 0.400=4.8`.
You could also have said that `P=V^2/R` giving `12^2/30=4.8`.
Also the question is slightly over-specified, in that you could have deduced the current (assuming that the resistor obey's Ohm's Law) from `I=V/R=12/30=0.4`