Measurement and Instrumentation
A DC A-h meter is rated for 15 A, 250 V. The meter constant is 14.4 A-sec/rev. The meter constant at rated voltage may be expressed as

 3600 rev/KWh.
 960 rev/KWh.
 3750 rev/KWh.
 1000 rev/KWh.

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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 the magnitude of the quantity being measured.
 only phase of the quantity being measured.

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