What supplies the voltage to the USB?
The two outside contacts (of four contacts) are connected to the power supply in the computer.
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Pin 1 is 5 volts DC Pin 4 is ground.
The usual voltages produced by the power supply in a standard personal computer system are 5 volts and 12 volts. For more information see the Related Link shown below.
Clients have to accept 4.75 to 5.25V and must be able to send configuration data as low as 4.4V. Hubs are allowed to drop as much as 0.35V. By itself, a USB plug does not hav…e to supply more than 100mA; however up to 500mA can be negotiated between device and host. Some USB hosts simply offer up 500mA from the get-go. USB power supplies short the two data lines (white and green) which allows the device to probe for the fact that they're power supplies (i.e. that they provide the full 500mA without negotiation and that they won't respond to data).
Put a seprate transformer. It will solve this issue
The power supply in a PC is a complex device using switch mode circuitry and transformers to generate +and- 12v, for modems and communications ports. +and-5volts for the logic… circuitry,3volts for the processor. All these supplies are generated and electronically regulated. It is such a waste when they are thrown a way still working. They are mini masterpieces of electronic engineering and are capable of starting a car!
At Least, 115 volts. Which is standard from a wall outlet. If should not matter how many volts your computer needs, but the watts does. For most computers they need anywhere f…rom 100-800 watts.
A standard USB port (non 3.0) can provide up to 500mAh of power. This is on full power mode. A 3.0 port can, if plugged into a 3.0 device, provide up to 900mAh if configure…d to do so.
5 V +/- 0.25V (i.e. between 4.75 and 5.25 V)
Depending on the power supply, +12, -12, +5, - 5 and ground. Some also use 3.3.
It convert 220v or 115 to -12v and +12v by using many components and step down transformer.
In theory, voltage should be the same around the clock. In practice you may get a tad higher voltage at nights, as there's less load on the system. With most people asleep, th…ere aren't as many machines running.
A USB 3.0 connection provides about 5 volts DC (4.5 Vdc @ 0.9 A (4.5 Watts)