Question

A hair dryer designed for the 120 V outlets of the United States is taken to Europe where the outlets provide 240 V. What is the ratio v, of a transformer that allovws the hair dryer to operate in Europe?

a. 1/4
b. 2/1
c. 1/2
d. 4/1

Answer 1

Step-by-step explanation:

Below is an attachment containing the solution.

Answer 2

c. 1/2

Step-by-step explanation:

Transformer ratio: This can be defined as the ratio of the Secondary voltage to the primary voltage of a transformer.

From the question, the expression of the transformer ratio is given as,

v = Vs/Vp.................. Equation 1

Where v = transformer ratio, Vs = secondary voltage, Vp = primary voltage.

Note: The hair dryer is design for 120 V, when it is taken to Europe, the 240 V needs to be step down.

Given: Vs = 120 V, Vp = 240 V

Substitute into equation 1

v = 120/240

v = 1/2

The right option is c. 1/2