强电和弱电的区别（The difference between strong current and weak current）.docVIP

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强电和弱电的区别（The difference between strong current and weak current）.doc

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强电和弱电的区别（The difference between strong current and weak current）

强电和弱电的区别（The difference between strong current and weak current） The difference between strong current and weak current Difference between strong current and weak current Strong and weak currents are conceptually easy to distinguish, and the main difference is the difference in uses. Strong electricity is used as a power source, and weak electricity is used for information transmission. Specifically, they are broadly distinguished as follows: 1 、 AC frequency is different The frequency of strong electricity is generally 50Hz (Hz), called power frequency, which means the frequency of industrial power: the frequency of weak current is often high frequency or ultra high frequency, with KHz (kHz) and MHz (MHz) meter. 2, the transmission mode is different Strong current is transmitted by power line, and weak current is divided into cable and wireless. The radio is transmitted by electromagnetic wave. 3, power, voltage and current size is different Electric power KW (kw) and MW (MW) meter, voltage to V (V), KV (kV), current to A (an), kA (KA); weak power to W (Watts), mW (MW), voltage to V (V), mV (MV), current to mA (MA), uA (a), so the circuit can be formed by printed circuit or integrated circuit. Of course, the strong current also has high frequency (hundreds of KHz) and intermediate frequency equipment, but the voltage is higher and the current is larger. And flashlight and electric shaver, although the voltage is very low, power and current is very small, still strong. Due to the development of modern technology, the weak current has penetrated into the field of strong electricity, such as power electronics devices, wireless remote control, etc., but these can only be counted as the weak current in the strong current control part, it is still different from the charged strong current. In the field of building electrical equipment, people are used to divide it into two parts: strong current (power) and weak current (information). They have both similarities and diffe