I'm an EE major and something has always bugged me in the (self-chosen) little-as-possible interaction with circuits that I've had:
How can a voltage source be high voltage, low current? More specifically, how can the output current be variable given a specific voltage? Is it not as simple as applying V = IR? Given the R of the load you can find I? If, for example, a power supply limits the current out, how does this not directly limit the voltage out, assuming the same load?
Supposedly power lines use high voltage, but low current to transfer power, and they say touching high voltage lines isn't dangerous, as long as the current is low...how is the current not determined by the resistance of your body??
Please help restore the foundations of my supposedly good education.
2007-12-07
13:31:04
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10 answers
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asked by
R D
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