Conceptually, strong and weak electricity are generally easy to distinguish. The main difference is the difference in use. Strong electricity is used as a kind of power source, and weak electricity is used for information transmission. Specifically, they have the following differences:
(1) The frequency of different alternating currents is usually 50Hz (Hz), which is called “power frequencyâ€, which means the frequency of industrial electricity: the frequency of weak electricity is often high frequency or ultra high frequency, in KHz (kilohertz), MHz (megahertz) meter.
(2) Different transmission modes are transmitted by transmission lines, and transmission of weak currents is divided between wired and wireless. The radio is transmitted by electromagnetic waves.
(3) The power, voltage and current are different. The strong electric power is KW (kilowatt), MW (megawatt), the voltage is V (volt), KV (kV), and the current is A (A), kA (kilogram). Meter; weak electric power in W (watt), mW (milliwatts), voltage in V (volts), mV (millivolts), current in mA (milliamps), uA (microamperes), thus its circuit It can be constructed with a printed circuit or an integrated circuit.
Of course, there are high-frequency (hundreds of KHz) and medium-frequency equipment in high-voltage, but the voltage is higher and the current is larger. Another example is that flashlights and electric shavers, although low in voltage and low in power and current, are still strong. Due to the development of modern technology, weak electricity has penetrated into the field of strong electricity, such as power electronic devices, wireless remote control, etc., but these can only be counted as the weak electricity control part of the strong electricity, which is different from the controlled strong electricity.
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