Which measurement indicates a circuit might be out of limits?

Voltage is a critical measurement that can indicate whether a circuit is operating within its limits. When you measure voltage across a component or an entire circuit, you can determine if it is receiving the appropriate voltage supply as specified for normal operation. If the voltage level is too high or too low, it signifies that the circuit may be out of its designed operational limits and could potentially lead to malfunction or damage.

Continuity checks, while useful for determining whether a circuit path is intact, do not provide information about the operational limits of the circuit under normal load conditions. Similarly, current measurements indicate how much electrical flow is occurring within the circuit, but do not alone reflect whether voltages are at acceptable levels. Resistance measurements can help assess the integrity of components but do not indicate dynamic performance or operational limits in a live circuit.

Thus, monitoring voltage is essential for ensuring that circuits function as intended and remain within specified limits.