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The portable Blu-Ray DVD player is a great investment for the movie buff who is constantly on the go.

When comparing 240 volt power and 120 volt power, everything boils down to Joule's Law, which states that "Power = voltage x current."

A step-down voltage transformer will come in handy when you need to ‘change’ a 220-volt power supply to a 110-volt supply. Since the US runs on 110v electrical mains,

Plug adapters or travel adapters are useful for plugging devices into wall outlets that of carrying plug shapes. They are especially handy for travelers who want to use their devices