# calculate power

• December 12th 2007, 03:25 AM
hks
calculate power
hi...like to find out how do i go about calculating power if the current and resistance are changing with temperature as it rises?
thks
• December 12th 2007, 08:30 AM
topsquark
Quote:

Originally Posted by hks
hi...like to find out how do i go about calculating power if the current and resistance are changing with temperature as it rises?
thks

$P = \frac{V^2}{R}$
(I'm assuming the potential of the source doesn't change.)

See here for how temperature affects resistance. (You might want to look up the term "resistivity" as well.)

-Dan