1
an ac (alternating current) + verb
作为交流电的缩写，ac前可加不定冠词an。
An ac flows through the circuit.
交流电流过电路。
锕（一种放射性元素）
先理解核心含义，再看它在真实句子里的用法。
锕（一种放射性元素）
a radioactive element of the actinide series; found in uranium ores
An ac flows through the circuit.
交流电流过电路。
账户；记账货币
account; money of account
脂环族的
alicyclic
Most home appliances run on ac rather than dc.
大多数家用电器使用交流电而非直流电。
The power supply can output both ac and dc.
这个电源可以输出交流电和直流电。
Transformers are used to step up or step down ac voltage.
变压器用于升高或降低交流电压。
作为交流电的缩写，ac前可加不定冠词an。
An ac flows through the circuit.
交流电流过电路。
作为化学元素符号，ac通常视为不可数名词，不加冠词。
ac is used as a neutron source.
锕用作中子源。
Not this
The device uses AC current.
Use this
The device uses AC.
AC 是 alternating current 的缩写，本身已包含 'current'，所以 'AC current' 是赘余表达，应去掉 current。
Not this
We need an AC to run the machine.
Use this
We need AC to run the machine.
AC 表示交流电时是不可数名词，不能与不定冠词 a/an 连用，应去掉 an。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
锕同位素
The researchers studied the decay of the ac isotope.
研究人员研究了锕同位素的衰变。
锕提取
ac extraction from ore is a complex process.
从矿石中提取锕是一个复杂的过程。
交流电源
Many appliances run on ac power.
许多电器使用交流电源。
交流电压
The ac voltage in the house is 220 volts.
家里的交流电压是220伏。
交流电路
The electrician checked the ac circuit.
电工检查了交流电路。
Use AC naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
AC是交流电的英文缩写，像交流一样来回流动；锕（Ac）是元素周期表中的一个放射性元素，可记作‘啊，C位元素’。
Register: mixed; contexts: chemistry, physics, nuclear research (for actinium); electrical engineering, electronics, home appliances (for alternating current). Note: 由于'ac'可表示锕或交流电，使用语境差异较大：前者多见于科学研究，后者常见于电气工程和日常描述。通常需根据上下文判断。
These words all rhyme with 'ac' when pronounced as /æk/ (as in the chemical element actinium). Note that 'ac' is also commonly pronounced as /eɪ siː/ in the abbreviation 'AC' (alternating current), which does not rhyme with these words.
Dictionary facts from ECDICT, WIKTIONARY.