Need help with parts a and b Imagine a TV show in which the hero is lost in the

Question

Need help with parts a and b

Imagine a TV show in which the hero is lost in the woods at night. His phone's 1.5-V battery has sadly but necessarily died to provide a little suspense. Luckily, he realizes he has a 9-V battery in his pack, along with some wire and a few iron nails, so he can improvise a transformer to connect the 9-V battery to the phone, powering it without frying it! Well, so the show's writers would have us believe. a) Why couldn't he build a working transformer powered by a battery, no matter how skilled he is at rigging up 1. wilderness electronics? b) Putting aside the physics of (a), let's say that such a transformer could work. Somehow. To construct it, he'd wrap Ni turns of wire around one nail and connect the ends of that wire to the battery terminals, then N2 turns of wire around the second nail, connecting those wire ends to the phone, then hold the two nails together to maximize the shared magnetic flux. Should he wrap the wire around the nails so thatN>N2, or N2> N? Explain.

Explanation / Answer

1. a. one cannot build a direct transformer for converting higher voltage DC into lower voltage DC, because transformers work on the principle of electromagnetic induction which requires necessarily, an osscilating voltage source. Now since DC battery cannot providce an alternating voltage source, the transformers will not work on DC dource to convert its voltage into something else

b. N1 turns around nail 1 ( primary)

N2 turns around nail 2 ( secondary)

so for a step down transformer ( where the outpu voltage is lower than the input voltage)

N1/N2 = V1/V2

for step down, V1 > V2

hence

N1 > N2

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