 Related Questions Why does wattmeter's reading go negative? Latest Answer : If you have seen the wattmeter ratings, it will be (300V,10A,UPF) (Voltage,
Current, Power Factor)
That is wattmeter needs voltage and current to measure power. So a
wattmeter consists of two coils pressure coil, and current coil.
Pressure ... Can we measure reactive power by using only a single wattmeter? If Yes, How? Latest Answer : We can't measure the reactive power by using wattmeter. ... What is the constructional diffrence between LPF wattmeter and ordinary AC wattmeter? Latest Answer : Power is the quantity which depends on the product of current and voltage and if any-one of them is -ve then power will be -ve but if both are -ve then Power will be +ve. ... Wattmeter has two coils in it-the current coil & pressure coil, why is the pressure coil so named? How is the power being measured by the Wattmeter? Latest Answer : Current coil means it measure current of circuit & pressure coil means it measure voltage, when current coil is connected series, pressure coil connected parallel in one circuit ,as P=V*I*cosØ,
So we have V, I, & Ø=[1/tan(V/I)],
Now the power is being ... How is UPF Wattmeter different from LPF Wattmeter? Latest Answer : The UPF wattmeter is used to measure the power with better power factor. the LPF wattmeter is used to measure the power with lower power factor( Why pressure coil is named so in wattmeter circuit? Latest Answer : As pressure in pneumatic sysytem is analogaus to voltage that's why the coil connected to supply voltage in wattmeter is called pressure coil. ...
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