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Electronics and Communication Engineering - Measurements and Instrumentation - Discussion

Discussion Forum : Measurements and Instrumentation - Section 1 (Q.No. 14)
Measurements and Instrumentation
14.

Assertion (A): When a wattmeter is used for low impedance loads, the pressure coil is connected across the load.

Reason (R): A wattmeter measures apparent power.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true
Answer: Option
Explanation:

Wattmeter measures active power.

Discussion:
1 comments Page 1 of 1.
Kalidoss said:   9 years ago
If apparent power means(active power(only real power)+reactive power(power consumed by winding's to do work).

i.e useful power+useless power.

Therefore, wattmeter is used to measure VI(TRUE POWER ONLY).
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