A physicist travels from Austria to the Bahamas. She forgot the adapter to conne

Question

A physicist travels from Austria 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?
1) 360 primary windings, 717 secondary windings
2) 1389 primary windings, 348 secondary windings
3) 220 primary windings, 48400 secondary windings
4) 48400 primary windings, 220 secondary windings
5) 717 primary windings, 360 secondary windings
6) 348 primary windings, 1389 secondary windings

Its a multiple choice question, answer is one of above 6. No idea how to do problem thanks

Explanation / Answer

so Np/Ns = Vp/Vs

so Np/Ns = 110/220 = 1/2

so 1)

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