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Assertion (A): A wattmeter must be used for the measurement of power in a.c. circuit instead of merely an ammeter and a voltmeter.
Reason (R): Wattmeter measures average active and reactive powers.
  • a)
    Both A and R are true and R is a correct explanation of A.
  • b)
    Both A and R are true but R is not a correct explanation of A.
  • c)
    A is true but R is false.
  • d)
    A is false but R is true.
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Assertion (A): A wattmeter must be used for the measurement of power i...
A wattmeter must be used for the measurement of power in a.c. circuit instead of merely an ammeter and a voltmeter because the power factor can’t be measured with the help of voltmeter and ammeter.
Wattmeter measures average active power not average reactive power. Hence, reason is not a correct statement.
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Most Upvoted Answer
Assertion (A): A wattmeter must be used for the measurement of power i...
Explanation:

Assertion (A):
- A wattmeter must be used for the measurement of power in a.c. circuit instead of merely an ammeter and a voltmeter.

Reason (R):
- Wattmeter measures average active and reactive powers.

Analysis:
- The assertion is true because a wattmeter is specifically designed to measure power in alternating current circuits, taking into account both active (real) power and reactive power.
- The reason is false because a wattmeter measures only active power, not reactive power. Reactive power is measured using a separate instrument called a varmeter.
Therefore, the correct answer is:

c) A is true but R is false.
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Assertion (A): A wattmeter must be used for the measurement of power in a.c. circuit instead of merely an ammeter and a voltmeter.Reason (R): Wattmeter measures average active and reactive powers.a)Both A and R are true and R is a correct explanation of A.b)Both A and R are true but R is not a correct explanation of A.c)A is true but R is false.d)A is false but R is true.Correct answer is option 'C'. Can you explain this answer?
Question Description
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