Question

A North American tourist takes his 25.0-W, 120-V AC razor to Europe, finds a special plug adapter, and plugs it into 240 V AC. Assuming constant resistance, what power does the razor consume as it is ruined?

Answer 1

Values given in our problem are,

In North America, Value of the Power and Voltage are,

In Europe, the value of the Voltage is given and we have to calculate the value of the Power.

We know from the Definition of Power,

Solving for Resistance,

Since it is given that resistance is constant for the both cases. That is,

If Resistance in both the cases is R.

For First case

and For second case of Europe,

Equating R from both Equation We have,

Solving,

Putting values of the known quantities,

\*Answer*\

So, value of the Power consumed in Europe is 100 Watt.