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ES Lab Report 5.docx - 1.0 INTRODUCTION . .As ,...

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1.0 INTRODUCTION Transformers provide a simple means of changing an AC voltage  from one level to another. They may step up the voltage for  transmission of energy or step down the voltage for actual usage. As  electronic circuits need DC voltages to operate, rectifying circuits are  used to convert AC voltages to DC voltages, usually at voltages much higher than mains supply of 240V, 50Hz. For this laboratory, the  effects of internal factors within a transformer will be explored and  compared to ideal results. 2.0 SUMMARY OF RESULTS Transformer is a device used to change the voltages. The power in is  equal to the power in the transformer. And therefore the formula  I p *V = I s *V s . Also, the ratio of the number of turns (primary &  secondary)  is equal to the ratio of the input voltage over the output  voltage.
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3.0 CIRCUITS Circuit      1 Circuit      2
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Circuit      3 Circuit      4
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4.0 RESULTS 4.1 TRANSFORMER TE S T NOLOAD Rated Voltage240 V N O M I NA L M E ASU R E D TURNS R A T I O I N P U T V O LT A G E I N P U T O U T P U T V P I P P IN V 21 V 22 V P /V 21 V P /V 22 50 V 51.3 V 0.0 mA - 2.68 V 5.34 V 19.05 9.52 100 V 99.3 V 0.0 mA - 5.16 V 10.38 V 19.42 9.68 150 V 149 V 0.0 mA - 7.92 V 15.82 V 19.35 9.68 200 V 197 V 465.0 mA - 10.28 V 20.52 V 18.87 9.50 240 V 239 V 670.0 mA 8.7 W 12.56 V 25.04 V 19.14 9.56 250 V 247 V 279.0 mA - 12.97 V 25.90 V 19.14 9.59 WITH LOAD On 12V Winding V 21 I N P U T V O LT A G E I N P U T C U RR E N T I N P U T P O W E R OUTPUT VOLTAGE Measured OUTPUT CURRENT C a lc u l a t e d OUTPUT POWER C a lc u l a t e d EFF I C I E N C Y % C a lc u l a t e d 240 V 103 mA 14.5 W 12.52 V 368 A 4.61 W 31.8% R = 34.2Ω 4.2 HALF WAVE R E C T I F I C A T I O N MEASUREMENT WITH DS O Q UAN T I T Y M E ASU R E D C A L C U L A TE D I N P U T S - - V IN (RMS) 12.4 V
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