moblie radio unit
Yes as long as the hard drive has its own power supply and not powered by the USB port.
Egg timers are spring powered.
NOCan however be powered by a 120/ to 12 volt DC power supply plugged into wall socket. (Ensure the power supply has sufficient current rating to run the subwoofer)
There are many advantages of battery powered Christmas lights. For one, you will not have to worry about the power supply. In addition, they may be safer as the voltage will be much lower.
All power to a system comes through your power supply (or PSU), so yes the PSU can still power on, but the system will not work at all, so it will look like nothing is happening.
A USB hub that runs on the power provided though the USB cable (rather than a USB hub powered by an external electrical supply).
Almost all digital electronics use a AC to DC power supply. Digital electronics cannot handle AC. all electronics device having battery powered are using DC power supply http://www.wzmicro.com
A USB hard disks that does not require a power supply is powered by your computer via the USB connection. Where as others require an external power supply because of the amount of power they require. It is usually a "wall wart" type that plugs in to your wall socket with a lead that plugs in to the disk drive.
Solar Power is powered by the sun
If the power adapter isn't plugged in before the computer is powered on, then the computer will not power on. The power supply provides power to the rest of the computer (which allows it to boot). If the power supply doesn't get power, then the rest of the computer doesn't get power. This doesn't apply to a laptop if it has a charge stored in the battery.
Unlike the CRT monitor, LCD doesn't use as much power. So, the battery of the laptop is enough to power its LCD monitor. There is a power supply cables within the laptops. That cables carry the power from the battery to its LCD monitor and other power needed devices. It is the simplest answer of how is the LCD on the laptop powered?
I'm guessing but.... Maybe Garmin Nuvi 250W SatNav Probably the power rating on a power supply, although 250w is a bit low powered for a modern PC