Ok here is the question... The primary coil of a step-up transformer is connecte

Question

Ok here is the question... The primary coil of a step-up transformer is connected acrossthe terminals of a standard wall socket, and the resistor 1 with aresistance R1 is connected across the secondary coil. Thecurrent in the resistor is then measured. Next, the resistor2 with a resistance R2 is connected directly across the terminalsof the wall socket (without the transformer). The current inthis resistor is also measured and found to be the sxame as thecurrent in the resistor 1. How does the resistance R2 compareto the resitance R1? Is the answer R2=R1/(Np/Ns)^2?? If so can you explain it a bit... I'm confused. Thanks in Advance!! Ok here is the question... The primary coil of a step-up transformer is connected acrossthe terminals of a standard wall socket, and the resistor 1 with aresistance R1 is connected across the secondary coil. Thecurrent in the resistor is then measured. Next, the resistor2 with a resistance R2 is connected directly across the terminalsof the wall socket (without the transformer). The current inthis resistor is also measured and found to be the sxame as thecurrent in the resistor 1. How does the resistance R2 compareto the resitance R1? Is the answer R2=R1/(Np/Ns)^2?? If so can you explain it a bit... I'm confused. Thanks in Advance!!

Explanation / Answer

   For idealtransformer   NS /NP   =   VS /VP    Here   subscript S stands forsecondary while subscript P stands for primary.    Here   subscript S stands forsecondary while subscript P stands for primary.    a.   Current throughR1         I1   =   VS/ R1                                                 =   (VP* NS / NP) / R1                                                 =   VP* NS / NP *R1         ----------------(1)    b.   Current throughR2         I2   =   VP/R2                  --------------(2)    Giventhat    I1   =   I2                   =>   VP *NS / NP *R1   =   VP /R2    R2   =   (NP/ NS) * R1                                                 =   VP* NS / NP *R1         ----------------(1)    b.   Current throughR2         I2   =   VP/R2                  --------------(2)    Giventhat    I1   =   I2                   =>   VP *NS / NP *R1   =   VP /R2    R2   =   (NP/ NS) * R1

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