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定义
SI电阻单位，定义为1伏特电位差驱动1安培电流时两点间的电阻（1 Ω = 1 V/A）。
解释
Named after Georg Simon Ohm, who formulated Ohm's law (V = IR). A standard LED circuit resistor is typically 220–470 Ω; a human body's resistance ranges from 1,000 Ω (wet skin) to 100,000 Ω (dry skin). Resistors in series add directly: two 100 Ω resistors in series equal 200 Ω.
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