Which of the following explains why international travelers need to use special adapters when plugging a device designed to operate in the u. s. into a wall outlet in europe?
the increased voltage causes the device's resistance to increase, and the device won't work.
the increased voltage causes the device's resistance to decrease, and the device will over-heat.
the increased voltage causes an increase in power usage, and the device will over-heat.
the increased voltage causes a decrease in power usage, and the device won't work.

The answer is: The increased voltage causes an increase in power usage, and the device will over-heat.

Explanation:

First, we must consider the variables of the electrical system that will allow us to respond. In this case, power, current and voltage, which are related by

Where P=Power, V=Voltage, I=Current.

In the equation it can be observed that power is directly proportional to the system voltage. Thus, if the voltage increases as in this case, the power will also increase, which overheats the device and can cause damage to it.

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