A physicist travels from Hong Kong to the Bahamas. She forgot the adapter to con

Question

A physicist travels from Hong Kong to the Bahamas. She forgot the adapter to connect her 220 Volts laptop to the 110 Volts outlet. Luckily, she finds a bunch of transformers in the lecture demo collection. Which one should she best use in which direction?

a. 320 primary windings, 631 secondary windings
b. 48400 primary windings, 220 secondary windings
c. 220 primary windings, 48400 secondary windings
d. 631 primary windings, 320 secondary windings
e. 1591 primary windings, 400 secondary windings
f. 400 primary windings, 1591 secondary windings

please explain

Explanation / Answer

She has to double up the voltage to make it useful. Transformer formula :

Vp/Vs = Np/Ns

Here Vp = 110V which is in the wall socket.

Vs = 220 V which will go to her laptop

Vp/Vs = 1/2 = Np/Ns

Thus Ns =2Np.

Option (a) is the closest match.

a. 320 primary windings, 631 secondary windings IS THE ANSWER.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.