Resistance
Abbr.r,R【Electricity】 The opposition of a body or substance to current passing through it,resulting in a change of electrical energy into heat or another form of energy.
縮寫 r,R【電學(xué)】 電阻：阻擋電流通過的物體或物質(zhì),從而把電能轉(zhuǎn)化為熱能或其它形式的能量.
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Intensity of current
Abbr.i I,電流強度
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U 電壓
American writers usually use the letter V for the quantity volts.In order to distinguish the quantity symbol from the unit symbol,we have here used U for the quantity voltage.U is the ANSI reserve symbol.
美國人通常使用字母V表示電壓.為了與單位電壓有區(qū)別,我們用U表示電壓,U是美國國家標(biāo)準(zhǔn)學(xué)會的候補符號.而用V表示單位電壓,即voltage .