- #1
skepticwulf
- 74
- 1
Suppose I have a tungsten filament lamp with a resistance 0,32 ohm
If it operates on 220V line, its power is P=V^2/R=151250W !
However, If the problem is given like , "you have a 100W with resistance 0,32 ohm what's the current? that'd come up as
I=Sqroot(P/R)=17,6A
First result doesn't make sense, or doesn't look "realistic" but the second one does. But they both stem from the same formula: P=IV
Why does it seem to me that these two formulas does not reconcile with each other?
If it operates on 220V line, its power is P=V^2/R=151250W !
However, If the problem is given like , "you have a 100W with resistance 0,32 ohm what's the current? that'd come up as
I=Sqroot(P/R)=17,6A
First result doesn't make sense, or doesn't look "realistic" but the second one does. But they both stem from the same formula: P=IV
Why does it seem to me that these two formulas does not reconcile with each other?