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Yes! you need to use a power adapter as well a plug adapter in Egypt from the UK.
European two pin, a US adapter will work.
The power adapter need 230v, 50Hz supply
This item uses an AC/DC power adapter
Power is multiplication of voltage and current. You need to know the load current drawing to establish the power. It is a bad idea to use 230 v adapter in 120 volts outlet
Dissconnect the ac adapter
No special power adapter is needed, because each device, is charged by it's own adapter. If laptops and desktops are connected by a wireless router, for example, the router will have it's own power adapter. However, to establish a wireless connection with a desktop , a laptop must have a wireless USB Wi-Fi adapter. This particular adapter has nothing to do with powering the device. It simply transmits signals to connect with a desktop, another laptop, PDA, cell phone, etc.
Every country has a different voltage of power source. It's better to use always an adapter if you don't know the voltage of power source of such country to avoid frying your devices.
DELL AC Adapters are manufactured with ID chips. The Laptop communicates with the AC adapter to find out the type and power rating. When the AC power adapter doesn't answer it doesn't charge the laptop battery. See the related link below for a full explanation of the problem.
to give power in the appliances,that we need in power.
It just needs the very minimal power that a computer can easily provide it with.
From what? If you need 12VDC for temporary use, there is a very good 12VDC source in your PC power supply.