Which measurement is usually expected when testing a blown fuse?

Which measurement is usually expected when testing a blown fuse?

• A. Full resistance
• B. Full voltage and infinite current
• C. Full voltage and no current
• D. Low voltage and high current

Answer: (C)

When testing a blown fuse, the expected measurement is full voltage and no current. This is because when a fuse is blown, it interrupts the circuit, preventing current from flowing. Therefore, if you measure the voltage across the fuse terminals, you will see the full voltage that is applied to the circuit, as the supply is still connected, but the interruption caused by the blown fuse means that there is no current passing through. In practical terms, the measurement indicates that the electric potential is present, but the circuit is open due to the blown fuse, resulting in no current flow. This understanding is crucial for diagnosing electrical issues, as it helps technicians confirm that the fuse has indeed failed.

When testing a blown fuse, the expected measurement is full voltage and no current. This is because when a fuse is blown, it interrupts the circuit, preventing current from flowing. Therefore, if you measure the voltage across the fuse terminals, you will see the full voltage that is applied to the circuit, as the supply is still connected, but the interruption caused by the blown fuse means that there is no current passing through.

In practical terms, the measurement indicates that the electric potential is present, but the circuit is open due to the blown fuse, resulting in no current flow. This understanding is crucial for diagnosing electrical issues, as it helps technicians confirm that the fuse has indeed failed.