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Questions and Answers
What is the main function of a transformer?
What is the main function of a transformer?
- Regulating the flow of electricity
- Changing the voltage and current levels (correct)
- Converting DC electric power to AC electric power
- Maintaining constant frequency and power
In a transmission line, why is a step-up transformer used?
In a transmission line, why is a step-up transformer used?
- To maintain constant frequency and power
- To convert AC power to DC power
- To regulate the flow of electricity
- To convert generated voltage to high voltage for proper transmission (correct)
What principle does a transformer work on?
What principle does a transformer work on?
- Boyle's law
- Ohm's law
- Faraday’s law of electromagnetic induction (correct)
- Newton's law of motion
What is induced when a carrying conductor is placed in a varying magnetic field?
What is induced when a carrying conductor is placed in a varying magnetic field?
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What is the relationship between input kVA and output kVA in a transformer?
What is the relationship between input kVA and output kVA in a transformer?
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Study Notes
Transformers
- The main function of a transformer is to transfer electrical energy from one circuit to another through electromagnetic induction.
- A step-up transformer is used in a transmission line to increase the voltage of the alternating current (AC) to reduce energy loss during transmission.
Operating Principle
- A transformer works on the principle of electromagnetic induction, where a varying magnetic field induces an electromotive force (EMF) in a coil.
Electromagnetic Induction
- When a carrying conductor is placed in a varying magnetic field, an electromotive force (EMF) is induced in the conductor.
Transformer Characteristics
- The input kVA and output kVA in a transformer are equal, as the transformer does not change the power (measured in kVA) but only the voltage and current.
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