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# Investigating the Number of Turns on the Secondary coil of a Transformer.

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Introduction

Investigating the Number of Turns on the Secondary coil of a Transformer ` Method In this experiment I intend to investigate how altering the number of turns on the secondary coil of a transformer can alter the voltage output. To do this I will use a power pack with an alternating current with an expected voltage of around 2 volts. I will wire this up to a digital voltmeter in parallel to give me the exact voltage output of the supply and also to a primary coil of the transformer with 10 turns of wire wound around it. The primary coil will be wound around a laminated soft iron core (the lamination prevents eddy currents from developing) ...read more.

Middle

speed throughout the experiment, as the number of coils and the input supply will remain constant, therefore the more coils of wire that are cut by the alternating current, the greater the secondary voltage that will be induced. This is because the lines of flux cut more wire. Background Knowledge I know that an alternating current is required to induce a current using a primary coil in a secondary coil. This is because the alternating current creates a constantly alternating magnetic field around the laminated soft iron core. This change in the magnetic field is responsible for the induced current in the secondary. I also know that the laminated soft iron core whilst not being vital for the operation of the transformer, increases efficiency by reducing eddy currents and linking the coils more effectively. ...read more.

Conclusion

Evaluation I think that on the whole my results are accurate. However, to improve my experiment further, I would take the results 5 times in order to prove that the values are completely accurate. I could also investigate a higher number of coils on the secondary and discover if in fact the voltage increases exponentially to infinity. This would improve my experiment considerably. I would also like to investigate the change in current during this experiment using digital Ammeters as well as digital Voltmeters so that I can investigate the change in current as the voltage increases. I assume that the current would decrease as the voltage increases, therefore balancing the result. ...read more.

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