Question 160Electricity/Electronics - QMED70% to pass
In troubleshooting a circuit in a console, you find that a resistor may be faulty. Which of the precautions listed must be observed when using an analog or digital multimeter set up as an ohmmeter to carry out this test?
AI Explanation
The correct answer is A) The resistor's circuit must be de-energized and at least one end of the resistor isolated by disconnecting.
This is the correct answer because when using an ohmmeter to test a resistor, the circuit must be de-energized and at least one end of the resistor must be disconnected from the circuit. This is necessary to isolate the resistor from the rest of the circuit and ensure an accurate resistance reading. If the circuit is energized, the ohmmeter could be damaged, and the reading would not be accurate.
The other answer choices are incorrect because:
B) Correct polarity is not necessary when testing a resistor, as the ohmmeter does not rely on the flow of current in a specific direction.
C) The ohmmeter must be connected in parallel with the resistor, not in series.
D) Twisting the meter leads is not necessary when testing a resistor.
Related Questions
#158 A digital multimeter is set up as an ohmmeter on the 1 kilo ohm scale. What does a display reading of 'OL' ohms as read across the ends of a wire conductor indicate? #159 If the approximate voltage to be measured in an electric circuit is not known, what should be done? #161 If a digital multimeter set up to measure AC volts reads slightly above 'zero' when its leads are disconnected, what is this a result of? #162 Which of the following precautions should be taken when troubleshooting various power circuits using a digital multimeter? #163 Circuit resistance is usually measured off-line (de-energized) with an ohmmeter. In the absence of an ohmmeter, however, resistance may be INDIRECTLY measured on-line (energized) using what meter (or meters)?