What is the potential difference across the battery used to power it?
if the potential difference across the bulb in a camping lantern is 9.0V.
A) 1.0V B)3.0V C)9.0V D) 18V
Potential difference is a fancy term for “voltage”.
So you are asking what is the voltage of a 9 volt battery. It is 9 volts. But only if the switch is turned on.
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Ozark Trail Mini LED Camp Lantern (ItemSea)