- #1
FaroukYasser
- 62
- 3
When to use P=I^2R, P=VI, P=V^2/R??
Hi,
I know that P = I^2R is to find heat loss. but can we use P = V^2/R or P = IV to find the heat loss? simply when do we use which?? (or can we use all anytime?)
The question said to find 1) the power GENERATED by a dc voltage source and to find the 2) Power dissipated in the power source
Should I multiply the voltage difference of the voltage source by the current passing through it to get the power generated and multiply current squared by its internal resistance to get the heat dissipated through it?
Thanks a lot![Jaw Drop :)) :))](/styles/physicsforums/xenforo/smilies/jawdrop.png)
Hi,
I know that P = I^2R is to find heat loss. but can we use P = V^2/R or P = IV to find the heat loss? simply when do we use which?? (or can we use all anytime?)
The question said to find 1) the power GENERATED by a dc voltage source and to find the 2) Power dissipated in the power source
Should I multiply the voltage difference of the voltage source by the current passing through it to get the power generated and multiply current squared by its internal resistance to get the heat dissipated through it?
Thanks a lot
![Jaw Drop :)) :))](/styles/physicsforums/xenforo/smilies/jawdrop.png)