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quiz1fa00_sols

quiz1fa00_sols - z Quiz1 Fa2000 q = current q is area under...

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s µ 1 s µ 2 s µ 5 . 0 I o current[A] The figure is a simplified model of the current produced by a lightning strike. The total charge is ________ [C] If the voltage of the lightning strike is 100 [MV] then the total energy carried by the strike is E = __________ [J] The average power of the strike is P = ___________[W] I o = 20[kA] Quiz1 Fa2000 q current q is area under curve = z mC C q A s q 25 ] [ 10 * 5 . 2 ] [ 10 * 20 * ] [ 10 * ) 2 5 . 0 ( 2 1 2 3 6 = = + = 2 10 * 5 . 2 Voltage is energy per unit charge. Hence when the voltage is is constant one has E = V*Q 6 10 * 5 . 2 Pav is energy over duration W P AV 12 6 6 10 * 25 . 1 10 * 2 10 * 5 . 2 = = Important point: VQ E WRITE CAN ONE CONSTANT IS VOLTAGE WHEN ONLY dt t i t v E power E = = = ) ( ) ( A 3 10 * 20 = V MV 8 10 ] [ 100 =

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