07_AC_electricity

Direct current dc 170 volts ac is like a battery where

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Unformatted text preview: hysics 121; 2008 UCSD: Physics 121; 2008 Alternating Current (AC) vs. Direct Current (DC) = 170 Volts • AC is like a battery where the terminals exchange sign periodically! • AC sloshes back and forth in the wires • Recall when we hooked up a bulb to a battery, the direction of current flow didn’t affect its brightness didn’ • Although net electron flow over one cycle is zero, can net electron still do useful work! – Imagine sawing (back & forth), or rubbing hands together to generate heat =...
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