Question

A technician is using a digital multimeter to test a ground circuit for excessive resistance. Technician A says to perform a voltage drop test on this circuit. Technician B says an ohmmeter is used and voltage must be present while performing this resistance test. Who is correct?

1) Technician A
2) Technician B
3) Both A and B
4) Neither A or B

Answer 1

Technician A is correct in suggesting a voltage drop test to check for excessive resistance in a ground circuit using a digital multimeter. Technician B is incorrect since an ohmmeter should be used with the power off.

Step-by-step explanation:

In testing a ground circuit for excessive resistance, Technician A suggests performing a voltage drop test, which is a method to detect a high resistance fault in a circuit. The voltage drop test is done by measuring the voltage across a wire or component with current flowing through it. Technician B suggests using an ohmmeter to measure resistance but requires that the voltage must be present while performing the test. However, this is incorrect as resistance measures with an ohmmeter should be performed with the power off to avoid damage to the meter and ensure an accurate measurement because the ohmmeter provides its internal voltage for the test.

Therefore, the correct answer is: 1) Technician A