Measurement and Instrumentation
A Manganin swap resistance is connected in series with a moving coil ammeter consisting of a milli ammeter and a suitable shunt in order to

 Obtaine large deflecting torque.
  Minimize the effect of temperature variation.
 Minimize the effect of stray magnetic fields.
 Reduce the size of the meter.

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Measurement and Instrumentation
A DC potentiometer is the best means available for the measurement of DC voltage because

 The precision in measurment is independent of the type of the defector used.
 None of above.
 It is possible to standardize before a measurement is undertaken.
  It is based on null balance technique.

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