When a ground circuit is tested the __________ should be removed and resistance measured.

When testing a ground circuit, it is essential to remove the power to ensure safety and accurate measurement of the circuit's resistance. The presence of live voltage can lead to misleading readings, as well as pose safety hazards to the technician performing the test. By disconnecting the power from the circuit, one can safely measure the resistance of the ground circuit without interference from the energized components, allowing for an accurate assessment of the ground connection's integrity and effectiveness.

This focus on removing power highlights the importance of eliminating any potential hazards and ensuring that the measuring instruments can provide reliable data during the testing process.