2.4.4 Transformers

• Transformers require a direct electrical connection between circuits.

  False
• The secondary coil delivers the transformed AC voltage to the load.


  True
• Match the component of a transformer with its function:

  Primary Coil ↔️ Receives AC voltage

  Secondary Coil ↔️ Delivers transformed voltage

  Iron Core ↔️ Enhances magnetic coupling
• When AC flows through the primary coil, it generates a changing magnetic field in the iron core.
• The primary coil generates a changing magnetic field in the iron
• The voltage in the secondary coil is directly proportional to the number of turns in the primary coil.

  False
• What are the two main types of transformers based on voltage transformation?

  Step-up and step-down
• In a step-up transformer, the voltage increases while the current decreases.


  True
• What is the function of the primary coil in a transformer?

  Receives AC voltage
• The iron core improves energy transfer by enhancing magnetic coupling
• The primary coil receives AC input and generates a changing magnetic field
• What are the key differences between step-up and step-down transformers?

  Ratio of coil turns
• Transformers can only step up voltage

  False
• What type of voltage does the secondary coil produce in a transformer?

  Transformed AC voltage
• What is the primary application of step-down transformers?

  Household voltage reduction
• Transformer efficiency measures the effectiveness of energy conversion


  True
• Transformers in the power grid are used to step up voltage for long-distance transmission
• A transformer uses the principle of electromagnetic induction to transfer electrical energy.
• The primary coil of a transformer receives AC voltage from the source.
• Transformers can either step up or step down the voltage.
• The iron core intensifies the magnetic field in a transformer.

  True
• What principle do transformers use to operate?

  Electromagnetic induction
• The secondary coil produces the transformed AC output voltage.

  True
• Transformers can step up or step down the voltage
• What happens to the current in a step-down transformer?

  It increases
• A transformer uses electromagnetic induction to transfer energy without a direct electrical connection
• What are the three main components of a transformer?

  Primary coil, secondary coil, iron core
• What is the ratio of turns between primary and secondary coils called?

  Turns ratio
• Transformers can only step down the voltage in electrical circuits.

  False
• Alternating current in the primary coil generates a changing magnetic field
• The iron core in a transformer concentrates the magnetic field
• Step-up transformers are used in power transmission to increase voltage
• What is the term for the ratio of primary turns to secondary turns in a transformer?

  Turns ratio
• Iron losses in a transformer are caused by hysteresis and eddy currents


  True
• What is a transformer?

  Changes AC voltage
• What are the two main types of coils in a transformer?

  Primary and secondary
• What is the purpose of the iron core in a transformer?

  Enhances magnetic coupling
• What generates a magnetic field in a transformer?

  Primary coil current
• What is induced in the secondary coil due to the changing magnetic field?

  Voltage
• What type of current is used in transformers?

  Alternating current (AC)