What is the outcome when the primary of a transformer is open?

What is the outcome when the primary of a transformer is open?

• A. No output from both primary and secondary
• B. Only primary has output
• C. Only secondary has output
• D. Increased secondary voltage

Answer: (A)

When the primary of a transformer is open, it means that there is no electrical connection allowing current to flow through the primary winding. In a transformer, the primary winding is responsible for creating a magnetic field when an alternating current (AC) is applied. This magnetic field induces a current in the secondary winding, enabling the transformer to step up or step down voltage based upon the turns ratio of the windings. Since the primary is open and no current flows through it, there will be no magnetic field generated. As a result, the secondary winding will not receive any induced current either, leading to no output voltage from the secondary as well. Therefore, when the primary of a transformer is open, the outcome is that there is no output from both the primary and secondary windings. This situation effectively renders the transformer inoperative.

When the primary of a transformer is open, it means that there is no electrical connection allowing current to flow through the primary winding. In a transformer, the primary winding is responsible for creating a magnetic field when an alternating current (AC) is applied. This magnetic field induces a current in the secondary winding, enabling the transformer to step up or step down voltage based upon the turns ratio of the windings.

Since the primary is open and no current flows through it, there will be no magnetic field generated. As a result, the secondary winding will not receive any induced current either, leading to no output voltage from the secondary as well. Therefore, when the primary of a transformer is open, the outcome is that there is no output from both the primary and secondary windings. This situation effectively renders the transformer inoperative.