強電和弱電從概念上講,一般是容易區別的,主要區別是用途的不同。強電是用作一種動力能源,弱電是用於信息傳遞。
交流頻率不同:強電頻率一般是50Hz,稱「工頻」(即工業用電的頻率);而弱電頻率往往是高頻或特高頻,以KHz、MHz計。
傳輸方式:強電以輸電線路傳輸,弱電傳輸分為有線和無線,無線弱電以電磁波傳輸。
功率、電壓及電流:強電的功率、電壓和電流一般會相對較大;而弱電則會小很多。
由於現代技術的發展,弱電已滲透到強電領域,如電力電子器件、無線遙控等,但這些只能算作強電中的弱電控制部分,它與被控的強電還是不同的。
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The difference between weak electricity and strong electricity
The AC frequency is different: the frequency of strong electricity is generally 50Hz, which is called "power frequency" (that is, the frequency of industrial electricity); while the frequency of weak electricity is often high frequency or ultra high frequency, measured in KHz, MHz.
Transmission mode: strong electricity is transmitted by power transmission lines, weak electricity transmission is divided into wired and wireless, and wireless weak electricity is transmitted by electromagnetic waves.
Power, voltage and current: The power, voltage, and current of strong electricity are generally relatively large; while that of weak electricity is much smaller.
Due to the development of modern technology, the weak current has penetrated into the strong current field, such as power electronic devices, wireless remote control, etc., but these can only be regarded as the weak current control part of the strong current, which is still different from the controlled strong current.
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