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A voltmeter connected across the broken (open) filament of a light bulb reads the

full voltage of the power supply whether the bulb is in a series or parallel circuit.

-- In a series circuit with other components in series with the bulb, this reading tells you

that at least one of the components is open, possibly the filament.

-- In a parallel circuit with other components in parallel with the bulb, or with

the bulb connected directly to the power supply, this reading tells you nothing ...

the voltmeter reads the full power supply voltage whether the bulb is open or good.

The voltmeter isn't a very helpful measurement to identify an open filament.

An ohmmeter, with the power to the circuit turned off, is much more helpful.

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12y ago

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