Yes, the USB mini adapters provide the same power as the full
sized adapters.
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You have to get UK power adapters for UK products. You can find
adapters, but this is not recommended for longterm use.
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No, not all power adapters work at the same speed and time. It
depends on the make and model of the computer. Universal adapters
also work at a slower speed.
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Most power adapters are an integral component of connector
adapter kits, which includes a series of cables.
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The average cost of laptop power adapters is about $80 to $100
USD. You can find more affordable power adapters, but the quality
and life span will not be as good.