An open winding in a split-phase motor is indicated by what reading on an ohmmeter?

An open winding in a split-phase motor is indicated by what reading on an ohmmeter?

• A. Zero
• B. 1 ohm
• C. Infinity
• D. 5 ohms

Answer: (C)

In a split-phase motor, an open winding refers to a situation where there is a break in the circuit of one of the windings, preventing current from flowing through it. When you measure the resistance of this open winding using an ohmmeter, it will indicate a reading of infinity. This means that there is no continuity in that part of the winding, consistent with the definition of an open circuit. When a winding is functional, you would expect a measurable resistance, such as the lower values found in the other options. A reading of zero would suggest a short circuit, while values like 1 ohm or 5 ohms indicate low resistance, which is typical for operational windings. However, in the case of an open winding, there should be no conductive path, thus leading to an infinite resistance reading on the ohmmeter. This understanding of circuit continuity is essential when troubleshooting issues in single-phase motors.

In a split-phase motor, an open winding refers to a situation where there is a break in the circuit of one of the windings, preventing current from flowing through it. When you measure the resistance of this open winding using an ohmmeter, it will indicate a reading of infinity. This means that there is no continuity in that part of the winding, consistent with the definition of an open circuit.

When a winding is functional, you would expect a measurable resistance, such as the lower values found in the other options. A reading of zero would suggest a short circuit, while values like 1 ohm or 5 ohms indicate low resistance, which is typical for operational windings. However, in the case of an open winding, there should be no conductive path, thus leading to an infinite resistance reading on the ohmmeter. This understanding of circuit continuity is essential when troubleshooting issues in single-phase motors.