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What is the principle behind a transformer?

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Question: What is the principle behind a transformer?

Options:

  1. Conservation of energy
  2. Electromagnetic induction
  3. Ohm\'s law
  4. Newton\'s laws

Correct Answer: Electromagnetic induction

Solution: 

The principle behind a transformer is electromagnetic induction, where a changing magnetic field induces an emf in a secondary coil.

What is the principle behind a transformer?

Practice Questions

Q1
What is the principle behind a transformer?
  1. Conservation of energy
  2. Electromagnetic induction
  3. Ohm's law
  4. Newton's laws

Questions & Step-by-Step Solutions

What is the principle behind a transformer?
  • Step 1: Understand that a transformer is a device used to change the voltage of electricity.
  • Step 2: Learn about electromagnetic induction, which is the process of generating electricity using a magnetic field.
  • Step 3: Know that a transformer has two coils of wire: a primary coil and a secondary coil.
  • Step 4: When electricity flows through the primary coil, it creates a magnetic field around it.
  • Step 5: If the current in the primary coil changes, the magnetic field also changes.
  • Step 6: This changing magnetic field passes through the secondary coil.
  • Step 7: The changing magnetic field in the secondary coil induces an electromotive force (emf), which generates electricity in the secondary coil.
  • Step 8: Depending on the number of turns in the primary and secondary coils, the voltage can be increased or decreased.
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