- #1
ShiroShibuya
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How is the phase difference between the current in the primary coil and induced e.m.f. in the secondary coil be 90*??
Phase differences in Transformers
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- Thread starter ShiroShibuya
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In summary, the conversation is discussing the phase difference between the current in the primary coil and the induced e.m.f. in the secondary coil. The source mentioned is a physics paper with a question that states a 90 degree phase difference. A link to the paper is provided.
- #2
anorlunda
Staff Emeritus
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What makes you think there is a phase difference? Do you have a link to your source?
- #3
ShiroShibuya
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Ofcourse.
A Level, physics paper 4 summer 5 question no. 6. In the mark scheme it says 90 degrees.
Of course.anorlunda said:
What makes you think there is a phase difference? Do you have a link to your source?
A Level, physics paper 4 summer 5 question no. 6. In the mark scheme it says 90 degrees.
- #4
ShiroShibuya
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ShiroShibuya said:
You will find it here,
https://papacambridge.com/past-papers/cie/sy-qp-ms/a-as-level/physics-9702/
1. What are phase differences in transformers?
Phase differences in transformers refer to the difference in the timing or alignment of the alternating currents in the primary and secondary windings of the transformer. This is caused by the difference in the number of windings and the magnetic coupling between the two windings.
2. Why do phase differences occur in transformers?
Phase differences occur in transformers due to the inductive nature of the primary and secondary windings. As the alternating current flows through the primary winding, it creates a changing magnetic field, which in turn induces a current in the secondary winding. The timing of these currents may not be perfectly aligned, resulting in a phase difference.
3. How do phase differences affect the performance of transformers?
Phase differences can cause a decrease in the efficiency of transformers as they can lead to power losses and increased heating. This can also result in distortion of the output voltage and current, affecting the accuracy of the transformer's operation.
4. Can phase differences be corrected in transformers?
Yes, phase differences can be corrected in transformers by using phase-shifting devices such as phase-shifting transformers or phase-angle regulators. These devices adjust the timing of the currents in the primary and secondary windings, reducing or eliminating the phase difference.
5. How can phase differences be measured in transformers?
Phase differences can be measured using instruments such as phase meters or oscilloscopes. These devices can measure the timing and amplitude of the currents in the primary and secondary windings, allowing for the calculation of the phase difference between them.
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