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Questions and Answers
What happens when AC current from the primary coil moves across the secondary coil?
What happens when AC current from the primary coil moves across the secondary coil?
- The primary coil becomes magnetized
- A constant magnetic field is created
- The secondary coil becomes demagnetized
- A moving magnetic field is created, inducing a current in the secondary coil (correct)
What is the main application of a step-up transformer?
What is the main application of a step-up transformer?
- To amplify sound waves
- To convert AC to DC
- To decrease the voltage for low-voltage devices
- To increase the voltage for high-voltage devices (correct)
What is the purpose of a microphone?
What is the purpose of a microphone?
- To convert sound waves to electronic signals (correct)
- To amplify sound waves
- To filter out noise
- To convert electronic signals to sound waves
What induces a current in the coil of a microphone?
What induces a current in the coil of a microphone?
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What is the formula to calculate the magnitude of the induced emf in a coil?
What is the formula to calculate the magnitude of the induced emf in a coil?
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Why is the absolute value of the EMF calculated?
Why is the absolute value of the EMF calculated?
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What is the unit of magnetic flux?
What is the unit of magnetic flux?
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What happens when the magnetic field changes uniformly from 0 to 0.500 T in 0.80 s?
What happens when the magnetic field changes uniformly from 0 to 0.500 T in 0.80 s?
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What is the purpose of electromagnetic induction?
What is the purpose of electromagnetic induction?
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What is the relationship between the number of turns in a coil and the induced emf?
What is the relationship between the number of turns in a coil and the induced emf?
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