When measuring the potential difference across a component, you need

Measuring potential difference Potential difference is measured using a device called a . Just like ammeters, some types have a pointer on a dial, but most have a digital display. However, unlike an ammeter, you must connect the voltmeter in parallel to measure the potential difference across a component in a circuit.

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the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.