draws a current of 4A at 120V and is 80% efficient?
2006-06-26 05:48:26 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Physics
What formula would you use to solve this?
2006-06-26 05:48:57 · update #1
I assume that a power factor is zero and current and voltage are given in RMS values then
Pin=IV= 4x120=480 Watts
Pout=.8 (Pin)= 384 Watts
Horsepower = Pout/ 746W = .515 HP or ~1/2 HP
2006-06-26 10:11:07 · answer #1 · answered by Seductive Stargazer 3 · 3⤊ 0⤋
Power input = IV = 4x120 W
Power output = 0.8 x4x120 W
So, in hp = 384/746 = 0.51474 hp
2006-06-26 05:54:52 · answer #2 · answered by ag_iitkgp 7 · 0⤊ 0⤋
assuming DC or no AC power factor to worry about...
Power = Volts x Amps in Watts.
you know the conversion HP to and from Watts.
you do the math like you are supposed to.
2006-06-26 05:54:36 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The 0.51hp answer is correct
2006-06-26 10:31:26 · answer #4 · answered by hippoterry2005 3 · 0⤊ 0⤋