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http://www.electrical4u.com/voltage-or-electric-potential-difference/http://www.electrical4u.com/voltage-or-electric-potential-difference/

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http://www.circuitstoday.com/wp-content/uploads/2009/09/True-RMS-Reading-Voltmeter.jpghttp://www.circuitstoday.com/ac-voltmeters

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