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Ideally they are supposed to be otherwise they wouldn't be galvanic cells since the purpose of a galvanic cell is to generate volts. If the cell potential was negative then it wouldn't be able to generate volts since cell potential represents the spontaneity of a reaction (positive means the reaction is spontaneous.)
Yes because the point of a galvanic cell is to use a spontaneous reaction to produce a current. Otherwise, if it wouldn't be doing useful work if the reaction were non-spontaneous i.e. having a negative potential.
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