Question 163Electricity/Electronics - QMED70% to pass
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)?
AI Explanation
The correct answer is B) voltmeter and an ammeter.
When an ohmmeter is not available, resistance can be indirectly measured on-line (energized) using a voltmeter and an ammeter. By applying Ohm's law (R = V/I), the resistance can be calculated by measuring the voltage (V) across the circuit and the current (I) flowing through it. This method allows for the indirect measurement of resistance without the need to de-energize the circuit.
The other options are incorrect because:
A) A frequency meter does not provide any information about the resistance of a circuit.
C) A voltmeter alone cannot provide enough information to calculate the resistance.
D) An ammeter alone cannot provide enough information to calculate the resistance.
Related Questions
#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? #164 Whether analog or digital, what are most AC voltmeters calibrated to measure? #165 Which of the meters listed should only be used after a circuit has been electrically de-energized? #166 What practice could potentially damage a multimeter?