1.In two wattmeter method if one wattmeter shows Negative
reading then wat is reason?
2.Wat is the reason for low voltage in houses?
3.Wat is meant by current and voltage? wat is difference
between the two?
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Answer Posted / dileep
two watt meter method is used in measurement of power under un balanced condition.there are two reasons for - ve value
1). if load consist of more inductivd or capacive load with negligible resistive then it will show _ve value .pf angle is more than 65 deg
. in case of induction motor no load test one of the watt meter will indicate _ve because no load pf is 0.2 lag pf angle is nearer to 75 deg
2).reverse. connections of current coil
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