Measurement and Instrumentation
The resistance of a circuit is measured from the relation R= P/I2, where P is the power fed into the circuit and I is the current flowing through it. If the limiting errors in the measurement of power and current are respectively ± 1.0% and ± 1.0%, then what will be the limiting error in measurement of resistance ?

 ± 1.5%
 ± 3.0%
 ±3.5%
 ±0.5%

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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

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

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