Which testing measures the voltage loss across electrical conductors?

Voltage drop testing is specifically designed to measure the loss of voltage as electrical current flows through conductors. This testing is crucial in ensuring that the voltage at the load end of a circuit remains sufficient for proper operation. When current travels through conductors, it encounters resistance, which leads to a reduction in voltage—the voltage drop.

This type of testing involves applying a known load to a circuit and measuring the voltage at both the source and the load. The difference between these two readings indicates the amount of voltage lost due to resistance in the conductors. Maintaining an acceptable voltage drop is essential for the efficiency and performance of electrical systems, as excessive voltage drop can lead to equipment malfunction and reduced energy efficiency.

The other options focus on different aspects of electrical testing. Resistance testing is aimed at assessing the resistance of conductors and connections but does not measure voltage drop directly. Power quality assessments look at factors like harmonics and supply voltage fluctuations, not specifically the drop caused by the load. Load testing evaluates the system's ability to handle an intended load, which may indirectly relate to voltage drop, but does not specifically measure the voltage loss across conductors.