The potential difference across a resistor 'r' carrying current 'I' IS Ir.
( 1 ) If the potential difference across 'r' is measured using a voltmeter of resistence 'Rv', s
how that the reading of voltmeter is less thsn the true value.
2. find the percentage error in measuring the potential differene by a voltmeter
3.At what value of Rv, does the voltmeter measures the true potential difference