Word · Frequency #4250
AC
锕（一种放射性元素）
a radioactive element of the actinide series; found in uranium ores
- 1.
account; money of account
账户；记账货币
- 2.
alicyclic
脂环族的
交流电；账户；记账货币；脂环族的
In use
Most home appliances run on ac rather than dc.
The power supply can output both ac and dc.
Transformers are used to step up or step down ac voltage.
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。
ac (actinium) + verb + as + noun
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。
Common mistakes
The device uses AC current.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。
We need an AC to run the machine.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。
Connections
Collocations
- ac isotope
- 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。
- ac extraction
- 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。
- ac power
- 交流电源
- Many appliances run on ac power.许多电器使用交流电源。
- ac voltage
- 交流电压
- The ac voltage in the house is 220 volts.家里的交流电压是220伏。
- ac circuit
- 交流电路
- The electrician checked the ac circuit.电工检查了交流电路。
Synonyms
Learner notes
Memory Tip
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’。
Context & Register
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。
Pronunciation & Spelling
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.
Usage priority
Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
Learn the forms together
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.