What should you do when testing a DC circuit?

When testing a DC circuit, it's important to isolate specific components to ensure safety and accuracy in measurements. Disconnecting A1 and A2 helps eliminate the possibility of short circuits or inaccurate readings that can occur if the circuit is still connected to an active power source or load. A1 typically represents a terminal associated with the power source, while A2 is usually associated with the ground or return path. By disconnecting these points, you can perform tests without risking damage to the multimeter or other testing equipment, and you reduce the dangers associated with live circuits.

This approach allows the technician to measure voltages or resistances effectively without interference from other circuit components or loads, ensuring that the readings reflect only the circuit being tested. Testing under these conditions helps maintain the integrity of the circuit and the safety of the person performing the test.