Measurement and Instrumentation
Some wire- wound resistors have bifilar winding. This type of winding is used to

Reduce the inductance of winding
Reduce the tolerance
Increase the thermal stability
Double the power rating of the resistor

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Measurement and Instrumentation
Potentiometer method of DC voltage measurement is more accurate than direct measurement using a voltmeter because

  It does not load the circuit at all.
 It uses centre zero galvanometer instead of voltmeter.
 It loads the circuit to maximum extent.
 It loads the circuit moderately.

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