5 Questions
What is the main function of a transformer?
Changing the voltage and current levels
In a transmission line, why is a step-up transformer used?
To convert generated voltage to high voltage for proper transmission
What principle does a transformer work on?
Faraday’s law of electromagnetic induction
What is induced when a carrying conductor is placed in a varying magnetic field?
An electromotive force
What is the relationship between input kVA and output kVA in a transformer?
It can vary, not always equal
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.
Test your knowledge of electrical machines with this quiz on transformers, DC machines, induction motors, and synchronous machines. Learn about the functions and principles of single-phase transformers and their role in converting AC electric power at different voltage levels.
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