1, AC frequency is different
Strong power frequency is generally 50Hz (Hz), called "industrial frequency", that is, the frequency of industrial electricity: weak power frequency is often high or ultra-high frequency, to KHz (kHz), MHz (MHz).
2, the transmission method is different
Strong power transmission lines to transmission, weak power transmission of wired and wireless. Radio is transmitted by electromagnetic waves.
3, power, voltage and current size
Strong power to KW (kilowatts), MW (megawatts), voltage to V (volts), KV (kilovolts), the current to A (A), kA (kiloamps); weak power to W (watts), mW (milliwatts), voltage to V (volts), mV (millivolts), the current to mA (milliamps), uA (microamps). Counting, and thus its circuit can be composed of printed circuits or integrated circuits.
Of course, there are high-frequency (hundreds of KHz) and intermediate-frequency devices, but the voltage is higher, the current is also larger. Another example is the flashlight and electric shaver, although the voltage is very low, the power and current is very small, but still belongs to the strong electricity. Due to the development of modern technology, weak power has penetrated into the field of strong power, such as power electronics, wireless remote control, etc., but these can only be counted as a strong power in the control of the weak part of the power, it is controlled with the strong power is still different.
Expanded:
Strong power refers to the electrical part of the field of electrical engineering. Characterized by high power, high current and low frequency, the main consideration is low loss and high efficiency. And weak power is very close to the opposite of "weak power".
Weak power generally refers to DC circuits or audio, video circuits, network circuits, telephone lines, AC voltage is generally within 36V. Household appliances such as telephones, computers, television signal input (cable lines), audio equipment (output lines) and other household appliances are weak electrical equipment.
Strong and weak electricity conceptually, generally easy to distinguish, the main difference is the different uses. Strong electricity is used as a power source. Weak electricity is used as a signaling electricity. Voltage is not a way to distinguish between strong and weak electricity.
In the electric power system, the voltage below 36v is called safe voltage, the voltage below 1kv is called low voltage, the voltage above 1kv is called high voltage, the line directly supplying power to the user is called distribution line, such as the user's voltage is 380/220v, then it is called low-voltage distribution line, that is, the strong power as stated in the home renovation (because it is the highest voltage used in the home). Strong electricity generally refers to DC voltage above 24V. Such as home lights, sockets, etc., the voltage of 110V ~ 220V. household electrical lighting, electric water heaters, heaters, refrigerators, televisions, air conditioners, audio equipment and other electrical appliances are strong electrical equipment.
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