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Measurements and Instrumentation - Engineering

Q1:

Which of the following methods can be used to measure power in a single phase circuit without using wattmeter?
  1. One voltmeter, one ammeter
  2. Two voltmeters, two ammeter
  3. Three voltmeters
  4. Three ammeters

A 1 and 2 only

B 2 and 4 only

C 1 and 3 only

D 3 and 4 only

ANS:D - 3 and 4 only

Single phase power can be measured using either 3 voltmeters or 3 ammeters.