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# GCSE Physics watch

1. if a battery is 5V, would the reading of a voltmeter across the battery be 5V or 0V
2. Why would it be 0V?
3. (Original post by StayWoke)
Why would it be 0V?
because it's the difference in potential, 12V goes out but 12V goes back in
4. (Original post by ursbhhdb)
because it's the difference in potential, 12V goes out but 12V goes back in
That's not how voltages work. Think of it as a force (i.e. Electro Motive Force). I like the pumbing analagy - the voltage is like the water pressure difference (well, force) and the current is the water flow. The peessure is still there even if there is no flow, as it the case with an ideal voltmeter. The battery is like a pump.
5. (Original post by RogerOxon)
That's not how voltages work. Think of it as a force (i.e. Electro Motive Force). I like the pumbing analagy - the voltage is like the water pressure difference (well, force) and the current is the water flow. The peessure is still there even if there is no flow, as it the case with an ideal voltmeter. The battery is like a pump.
so essentially the voltage would be 5?
6. (Original post by ursbhhdb)
so essentially the voltage would be 5?
Yes. An ideal battery will always generate the same potential difference, regardless of the current that flows.

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