The USB socket does not consume power when the USB flash drive is not inserted.
The so-called power consumption, there must be a current in the work, no current, there will be no power consumption.
The pins of the USB socket are divided into two parts: power (positive and negative) and data pins. When there is no U disk inserted, naturally there is no data exchange; The positive and negative power supply pins only have voltage, there is no U disk inserted, there is no current loop, so it will not consume power.
When the USB socket is connected to a USB flash drive or used as a charging port for other appliances, power consumption begins, but it is minimal. Because the maximum output current of the USB socket of the computer is usually designed within 2A, its output power is about 10W, and individual new mobile phone chargers or charging banks are in the range of 2-5A, at best within 25W, and it takes 40 hours to consume 1 degree of power.
The usb socket should also charge electricity when it is empty. Here's why:
1, the USB socket is actually a 5V power supply, the components of which have a service life. Long-term live work, safety life is not more than 5 years.
2, any power supply without load will consume power, this USB charging socket has no switch, will always consume power.
3, the charger output current is usually designed for a specific tablet computer to meet its different current needs, and some of the voltage is not necessarily 5V. With USB socket power supply, the current and voltage may not match.
No electricity, because the power is very small, the power of the USB socket is only stockings, because the internal contains a regulator, the regulator can firmly stabilize the voltage, so the power consumption is very small, when using the USB socket in daily life, we must pay attention to the daily maintenance of the USB socket, can not enter the water, can not enter the dust, Are there conductive products that cannot be inserted into the USB interface nevus at the same time?
Otherwise, there is a risk of power failure
It doesn't cost electricity, it just has a built-in 5V switching power supply, which is easy for users to charge small electronic products