An AC power generator produces 25 A (rms) at 3600 V. The energy is transmitted t

Question

An AC power generator produces 25 A (rms) at 3600 V. The energy is transmitted through a long-distance power line, which has a total resistance of 100 ohms. What percentage of the power delivered by the generator is dissipated as heat in the long-distance line if a step-up transformer is not used?

A. 0.09%

B. 1.8%

C. 32%

D. 69%

Determine the amount of energy carrier in 1.0 m of a 3.5 mW He-Ne laser beam if the cross-sectional area of the beam is 5.0 x 10^-6 m^2.

A. 0.012 J

B. 4.1 x 10^-8 J

C. 1.2 x 10^-11 J

D. 1.0 J

Explanation / Answer

1. C. 32%

2. C. 1.2 x 10^-11 J

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