Transformer Principles and Functions

The video tutorial explains the structure and function of transformers, which consist of an iron core wrapped in coils. It covers the difference between primary and secondary coils, and how transformers can step up or step down voltage. The tutorial details the process of how alternating current induces a magnetic field, which is then converted back into current by the secondary coil. An example is provided to demonstrate voltage calculation in a step down transformer using a simple ratio formula.

What is the primary function of the iron core in a transformer?

• To conduct electricity between coils

• To reduce energy loss

• To insulate the coils

• To enhance the magnetic field

What is the role of the primary coil in a transformer?

• To step up the voltage

• To convert magnetic flux into current

• To connect to the output circuit

• To induce a magnetic field in the core

In a step-down transformer, how does the number of turns in the primary coil compare to the secondary coil?

• The primary coil has fewer turns

• Both coils have the same number of turns

• The primary coil has more turns

• The secondary coil has more turns

Which type of transformer has more turns in the secondary coil than in the primary coil?

• Step-up transformer

• Isolation transformer

• Step-down transformer

• Auto transformer

What happens when an alternating current flows through the primary coil of a transformer?

• It generates heat in the core

• It creates a static electric field

• It induces a magnetic field in the core

• It directly powers the secondary circuit

What is the result of a changing magnetic field in the core of a transformer?

• It creates a static electric field

• It increases the resistance in the core

• It induces a current in the secondary coil

• It reduces the voltage in the primary coil

How does the secondary coil in a transformer produce voltage?

• By directly connecting to the primary coil

• By reducing the magnetic field

• By converting magnetic flux into current

• By increasing the resistance

What is the purpose of the load resistance in the secondary circuit of a transformer?

• To increase the voltage

• To decrease the current

• To utilize the output voltage

• To insulate the circuit

What is the voltage in the secondary circuit if the primary voltage is 120V and the turn ratio is 0.5?

• 60V

• 120V

• 240V

• 30V

How is the voltage ratio between the secondary and primary coils determined?

• By the current in the primary coil

• By the size of the iron core

• By the turn ratio of the coils

• By the resistance in the secondary circuit