2007-11-15 17:22:33 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Power = V x I = I² x R = V² / R
Voltage = 12V, Current = 5Amps, Resistance=V/I =12/5 =2.4 Ω
Power = V x I = 12 x 5 = 60 watts
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Power = I²R = 5 x 5 x 2.4 = 60 watts
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Power = V² / R = (12x12) / 2.4 = 144 / 2.4 = 60 watts
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2007-11-15 17:43:33 · answer #1 · answered by Joymash 6 · 0⤊ 0⤋
The light bulb draws 12A x 5V = 60W. The actual wattage rating of the bulb may be different, if it was designed to work at some other voltage. For example, a normal 60W bulb designed for 120V service will only use about 6 watts at 12V, and give no light to speak of. The scaling won't be exact, because the resistance of the bulb varies with temperature.
2007-11-15 17:51:17 · answer #2 · answered by injanier 7 · 0⤊ 0⤋
Wild Guess
60 W
2007-11-15 17:27:23 · answer #3 · answered by JavaScript_Junkie 6 · 0⤊ 0⤋
watts = volts X amps
you can do the math.
2007-11-15 17:25:38 · answer #4 · answered by don_sv_az 7 · 0⤊ 0⤋