13.2 Transformers

• The primary winding induces a changing magnetic field in the core, which in turn induces a voltage in the secondary winding.voltage
• Match the winding with its description:

  Primary winding ↔️ Carries high-voltage AC input

  Secondary winding ↔️ Carries transformed voltage output
• Steps in the principle of electromagnetic induction in transformers:

  1️⃣ Primary winding generates magnetic field

  2️⃣ Magnetic field spreads through core

  3️⃣ Secondary winding receives and transforms voltage
• The primary winding in a transformer generates the magnetic field.

  True
• Steps in the voltage transformation process in a transformer

  1️⃣ A changing magnetic field is generated in the soft iron core

  2️⃣ A voltage is induced in the secondary winding

  3️⃣ The voltage transformation is determined by the turns ratio
• Match the winding with its role in determining the voltage change:

  Primary winding ↔️ Determines the voltage change alongside the secondary winding

  Secondary winding ↔️ Determines the voltage change alongside the primary winding
• A transformer uses electromagnetic induction to change the voltage of an alternating current
• Match the component with its role in a transformer:

  Primary winding ↔️ Receives high-voltage AC input

  Secondary winding ↔️ Outputs transformed voltage

  Soft iron core ↔️ Enhances and channels the magnetic field
• The current ratio in a transformer is inversely proportional to the turns ratio.


  True
• What is the current ratio in a transformer defined as?

  \frac{I_{p}}{I_{s}} = \frac{N_{s}}{N_{p}}</latex>
• What is the role of the primary winding in a transformer?

  Input coil with high voltage
• The voltage transformation in a transformer depends on the turns ratio.


  True
• What is the turns ratio in a transformer defined as?

  $\frac{N_{p}}{N_{s}}$
• What is the role of the soft iron core in a transformer's construction?

  Enhances magnetic field
• What is the function of the secondary winding in a transformer?

  Carries transformed voltage
• How does the iron core channel magnetic flux in a transformer?

  Directs flux from primary to secondary
• What is the formula for the voltage ratio in a transformer?

  $\frac{V_{p}}{V_{s}} =$$\frac{N_{p}}{N_{s}}$
• A transformer uses electromagnetic induction to change the voltage of an alternating current (AC) electrical supply.voltage
• Electromagnetic induction in transformers requires a direct current (DC) supply.

  False
• What type of current is used in transformers?

  Alternating current
• The primary winding generates a changing magnetic field in the soft iron core
• A transformer consists of two coils of wire wound around a soft iron core
• The secondary winding in a transformer receives high-voltage AC input.

  False
• The secondary winding carries the transformed voltage in a transformer.


  True
• The primary winding carries the high voltage AC supply.

  True
• In a transformer, the primary winding carries the high voltage AC supply
• The iron core in a transformer reduces energy loss by minimizing eddy currents.


  True
• A transformer with 100 primary turns and 50 secondary turns has a voltage ratio of 2:1
• A transformer with 100 primary turns and 50 secondary turns has a voltage ratio of 2:1.


  True
• What is the role of the secondary winding in a transformer?

  Provides transformed voltage
• Steps of electromagnetic induction in transformers

  1️⃣ Primary winding generates a changing magnetic field

  2️⃣ Magnetic field spreads through the iron core

  3️⃣ Magnetic field induces voltage in secondary winding
• The primary winding carries high voltage AC and generates a changing magnetic field.


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

  Carries high voltage AC
• Using soft iron in the core reduces energy loss in the transformer.

  True
• What is the formula for the current ratio in a transformer?

  \frac{I_{p}}{I_{s}} = \frac{N_{s}}{N_{p}}</latex>
• What is the voltage ratio in a transformer with primary voltage 200V and secondary voltage 50V?

  4:1
• The transformer formula relates voltage, current, and the number of turns in the primary and secondary windings.
• In the transformer formula, Vs represents the secondary voltage.
• In the transformer formula, Np represents the number of turns in the primary winding.
• If a transformer has 200 primary turns, 50 secondary turns, and a primary voltage of 240V, the secondary voltage is 60V.