A high-voltage discharge tube is often used to study atomic spectra. The tubes r

Question

A high-voltage discharge tube is often used to study atomic spectra. The tubes require a large voltage across their terminals to operate. To get the large voltage, a step-up transformer is connected to a line voltage (120 V rms) and is designed to provide 500D V (rms) to the discharge tube and to dissipate 75.0 W. (a) What is the ratio of the number of turns in the secondary to the number of turns in the primary? (b) What are the rms currents in the primary and secondary coils of the transformer? (c) What is the effective resistance that the IZD-V source is subjected to?

Explanation / Answer

Vp/Vs= Np/Ns where p-primary and s-secondary

120/5000 =Np/Ns

Ratio second to the primary= Ns/Np= 41.667

b) Power(P)= V*I ; for primary 75= 120*Ip ; Ip= 625 mA

for the secondary, 75= 5000*Is; Is=15 mA

c) P=V2/R ; for the secondary

75= 50002/R ; R= 333.33 kOhms

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