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定義
SIの電位差（電圧）の単位で、1クーロンの電荷あたり1ジュールのエネルギーとして定義される（1 V = 1 J/C）。
解説
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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