Question
Download Solution PDFDynamometer type wattmeter responds to the __________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFA dynamometer-type wattmeter gives the value of active power but not reactive power. It detects the average value of power.
Wattmeter:
A wattmeter is an electrical instrument that is used to measure the electric power of any electrical circuit.
The internal construction of a wattmeter is such that it consists of two coils. One of the coils is in series and the other is connected in parallel.
The coil that is connected in series with the circuit is known as the current coil and the one that is connected in parallel with the circuit is known as the voltage coil
The wattmeter measures the average power.
The reading of the wattmeter will be,
Average power = Vpc Icc cos ϕ
Where,
Vpc is the voltage across the pressure coil
Icc is current flows through the current coil
ϕ is the phase angle between Vpc and Icc
So, a wattmeter is a device capable of detecting voltage, current and the angle between the voltage and the current to provide power readings.
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