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%
 ±0.5%
 ± 3.0%
 ±3.5%

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Measurement and Instrumentation
In AC circuits, the connection of measuring instruments cause loading effect errors which may effect

 both of above.
 magnitude, phase and waveform of the quantity being measured.
 only phase of the quantity being measured.
 only the magnitude of the quantity being measured.

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