18. The primary coil of a step-up transformer is connected acrossthe terminals o

Question

18.   The primary coil of a step-up transformer is connected acrossthe terminals of a standard wall socket, and resistor 1 with aresistance R1 is connected across the secondary coil.The current in the resistor is then measured. Next, resistor 2 witha resistance R2 is connected directly across theterminals of the wall socket (without the transformer). The currentin this resistor is also measured and found to be the same as thecurrent in resistor 1. How does the resistance R2compare to the resistance R1? The primary coil of a step-up transformer is connected acrossthe terminals of a standard wall socket, and resistor 1 with aresistance R1 is connected across the secondary coil.The current in the resistor is then measured. Next, resistor 2 witha resistance R2 is connected directly across theterminals of the wall socket (without the transformer). The currentin this resistor is also measured and found to be the same as thecurrent in resistor 1. How does the resistance R2compare to the resistance R1? 18.   The primary coil of a step-up transformer is connected acrossthe terminals of a standard wall socket, and resistor 1 with aresistance R1 is connected across the secondary coil.The current in the resistor is then measured. Next, resistor 2 witha resistance R2 is connected directly across theterminals of the wall socket (without the transformer). The currentin this resistor is also measured and found to be the same as thecurrent in resistor 1. How does the resistance R2compare to the resistance R1?

Explanation / Answer

We have          Is = Vs / R1 Substitute this in                 Is = Ip ( Np / Ns)             Vs / R1 = Ip ( Np / Ns) then substitute Vs in      Vs = Vp Ns / Np Then finally u get           Ip = ( 1 /R1 ) ( Ns / Np )2 Vp comparing this with          Ip = Vp/ R2 then we have R2 = (Np / Ns)2R1 I hope this helps you.

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