When testing a circuit breaker in the closed position, the resistance between the terminals should measure __________.

When testing a circuit breaker in the closed position, the resistance between the terminals should measure __________.

• A. greater than one ohm
• B. exactly one ohm
• C. less than one ohm
• D. about five ohms

Answer: (C)

When testing a circuit breaker in the closed position, the resistance between the terminals should measure less than one ohm. This low resistance indicates that the circuit breaker is functioning properly, allowing current to flow with minimal opposition. A reading below one ohm signifies that the breaker is adequately closed and that connections are secure, ensuring efficient operation. Higher resistance values, such as greater than one ohm or about five ohms, would suggest potential issues such as poor connectivity, corrosion, or even a fault within the breaker itself. In such cases, excessive resistance could lead to reduced performance and potential overheating, which can pose safety risks and affect the reliability of the electrical system. Therefore, a measurement of less than one ohm is essential for confirming that the circuit breaker is in good working condition when closed.

When testing a circuit breaker in the closed position, the resistance between the terminals should measure less than one ohm. This low resistance indicates that the circuit breaker is functioning properly, allowing current to flow with minimal opposition. A reading below one ohm signifies that the breaker is adequately closed and that connections are secure, ensuring efficient operation.

Higher resistance values, such as greater than one ohm or about five ohms, would suggest potential issues such as poor connectivity, corrosion, or even a fault within the breaker itself. In such cases, excessive resistance could lead to reduced performance and potential overheating, which can pose safety risks and affect the reliability of the electrical system. Therefore, a measurement of less than one ohm is essential for confirming that the circuit breaker is in good working condition when closed.