Question:easy
Resistances can be measured with the help of
Resistances can be measured with the help of
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Wheatstone bridge is most accurate for resistance measurement.
Updated On: Jul 2, 2026
- wattmeters
- voltmeters
- ammeters
- ohmmeters and resistance bridges
Show Solution
The Correct Option is D
Solution and Explanation
Step 1: Identify instruments by their operating principle.
A wattmeter measures electrical power using current and voltage coils. A voltmeter responds to voltage and an ammeter to current. None of these are calibrated to display resistance directly.
Step 2: Confirm which devices are purpose-built for resistance.
An ohmmeter contains an internal battery; it passes a known current through the unknown resistance and reads out the resulting voltage on a scale calibrated in ohms: $R = V/I$. A Wheatstone bridge uses a null-balance method to compare the unknown resistance against known standards.
Step 3: Conclude.
Only ohmmeters and resistance bridges are specifically designed and calibrated for the direct measurement of resistance. \[ \boxed{\text{Ohmmeters and resistance bridges}} \]
A wattmeter measures electrical power using current and voltage coils. A voltmeter responds to voltage and an ammeter to current. None of these are calibrated to display resistance directly.
Step 2: Confirm which devices are purpose-built for resistance.
An ohmmeter contains an internal battery; it passes a known current through the unknown resistance and reads out the resulting voltage on a scale calibrated in ohms: $R = V/I$. A Wheatstone bridge uses a null-balance method to compare the unknown resistance against known standards.
Step 3: Conclude.
Only ohmmeters and resistance bridges are specifically designed and calibrated for the direct measurement of resistance. \[ \boxed{\text{Ohmmeters and resistance bridges}} \]
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