Measurement and Instrumentation
When using ohmmeter, applied voltage is to be disconnected from the circuit because

Current will decrease resistance
Voltage source will increase resistance
None of these
The ohmmeter has its own internal battery

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

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

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