Physics · Current Electricity
When testing a dry cell using a voltmeter, why is a 'No-Load' voltage measurement often misleading regarding the cell's actual condition or 'Cell Life'?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Because the zero-reference level of the battery shifts when it is not connected to a chassis ground.
- 2Because dry cells only produce voltage when a low-resistance path is provided.
- 3Because an aging cell may still show its rated emf when no current is flowing, but its internal resistance increases, causing a massive voltage drop under load.✓
- 4Because the voltmeter itself consumes more power than the load.
Correct answer
Because an aging cell may still show its rated emf when no current is flowing, but its internal resistance increases, causing a massive voltage drop under load.
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