Consider moving to Europe and bringing along your favourite electric juicer to k

Question

Consider moving to Europe and bringing along your favourite electric juicer to keep you healthy and in shape while being deployed overseas. Your P = 850W fruit juicer is designed to operate at a typical North American voltage of VNA = 120V . You remember from your physics lecture at the Citadel that plugging your juice directly into a European power outlet operating at VEUR = 240V will end badly, however, you also recall that you can use a series resistor to reduce the voltage over your favourite drink maker you cannot live without. What electrical power is wasted (transformed into heat energy in the series resistor) when operating your juicer in Europe? Now consider you fell in love with a nice German washing machine that cleaned your muddy combat uniform so nicely and you want to bring it home to the United States. What do you have to do to connect it to a typical U.S. power outlet (verbal argumentation; no equations)?

Explanation / Answer

for the juicer in north america :

i = cuurent

VNA = 120V

P = 850W

i = P /VNA = 850/120

i = 7.1 A

In european power outlet :

Vr = voltage across the resistor connected in series = 120 Volts

i = current in the circuit = 7.1

P = i Vr = 7.1 x 120 = 852 watts

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