What will the current be?
2007-09-21 09:01:26 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Physics
I = sqrt(W/R)
2007-09-21 09:49:20 · update #1
Power = i² R
http://answers.yahoo.com/question/index;_ylt=AisiUYi4QxOT_VpLQT3AG4AjzKIX;_ylv=3?qid=20070718195551AA3HCsm
2007-09-21 09:40:07 · answer #1 · answered by 4 · 1⤊ 0⤋
You don't need the resistance--it's frequency dependent anyway.
Since P = IV, and V is what ~110VRMS? So IRMS ~ 1amp, a little less.
OK, yeah. If this is a homework problem, then let V=IR to get P=IR^2. I was thinking that you just measured the DC resistance of a hot light bulb, in which case it doesn't take into account the reactance at 60Hz, so the calculation IR^2 would overestimate your current. What was I thinking . . . I deserve three more thumbs down, at least!
2007-09-21 16:22:00 · answer #2 · answered by supastremph 6 · 0⤊ 3⤋