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定义
SI电位差（电压）单位，定义为每库仑电荷一焦耳的能量（1 V = 1 J/C）。
解释
Named after Alessandro Volta, inventor of the electrochemical battery. A standard AA battery provides 1.5 V; a household outlet delivers 120 V (US) or 230 V (Europe); a lightning bolt can reach 300 million volts. Voltage drives current through a circuit — doubling voltage doubles current if resistance stays constant (Ohm's law: V = IR).
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