Question

Two technicians are discussing a resistance measurement. Technician A states that components being measured should be removed or isolated from the circuit. Technician B states that power to the circuit should be disconnected when measuring resistance. Which technician is correct?

Answer 1

They're both right, but technician's A's statement is better. If you just disconnect the power, you still have other components that influence the resistance measurement. So although B's statement is true, it doesn't help.