A 50 Ω load uses 1 W of power. What is the output voltage of the power supply? The answer is 7.07 V, please explain the means by which this answer was derived.
2007-09-02 13:39:18 · 3 answers · asked by Chris 2 in Science & Mathematics ➔ Engineering
Power = voltage^2 / resistance
1 = v^2 / 50
50 = v^2
square-root(50) = v
7.07 = v
.
2007-09-02 13:56:39 · answer #1 · answered by tlbs101 7 · 0⤊ 0⤋
Let me give you some related formulae.
Power= Voltage x current=V x I
Current=Voltage/Resistance= V / R
Power = V x (V/R) = V² /R
1 watt = V² / 50 or V² = 50 x1= 50
V = â50 = 7.0711.....Ans
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2007-09-02 22:13:45 · answer #2 · answered by Joymash 6 · 0⤊ 0⤋
P=VI
P=I^2 R
1/50= .02 = I sqred
sq-root .02 =.141amp = I
P/I = V
1/.141 =7.07 volt
2007-09-02 20:58:05 · answer #3 · answered by mike 5 · 0⤊ 0⤋