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정의
전하 1 C당 1 J의 에너지로 정의되는 SI 전위차(전압) 단위(1 V = 1 J/C).
설명
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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