Measurement and Instrumentation
The resistance of a circuit is found by measuring current flowing and the power fed into the circuit. If the limiting errors in the measurement of power and current are ± 1.5% and ± 1.0% respectively, the limiting error in the measurement of resistance

 ± 1.5%
 ± 2.5%
 ± 3.5%
 ± 1%

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

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

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