Which of the following terms refers to the voltage testing of equipment to measure its resistance?

The term that refers specifically to the voltage testing of equipment to measure its resistance is insulation resistance testing. This type of testing is crucial in determining the integrity of electrical insulation within equipment, such as motors, transformers, and cables. By applying a voltage across the insulating material and measuring the resulting current, technicians can calculate resistance. A high resistance value indicates that the insulation is in good condition, which is essential for safe operation and preventing electrical faults.

Other terms listed relate to different testing methods. Voltage drop testing focuses on assessing the efficiency of the electrical distribution system by measuring the difference in voltage at different points in the circuit. Current testing measures the flow of electric current through a conductor. Ground testing ensures that grounding systems are properly installed and functioning to protect against electrical shock and equipment damage. Each of these terms serves distinct purposes in electrical testing and maintenance, but insulation resistance testing specifically targets the resistance of insulation materials.