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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
• 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
• Although net electron flow over one cycle is zero, can
still do useful work!
– Imagine sawing (back & forth), or rubbing hands together to
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