Is it possible to measure the PD of photocells using just a voltmeter?

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I've looked everywhere for information on photocells and a distance-output equation, but have found nothing.. Anyone got any ideas on this?

edit: forget it, sorry, i have found another thread on this forum . thanks guys. :D
 
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ok just one thing, the use of a voltmeter alone to measure the pd, i gather from your responses, is not possible. why?
 

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