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Why An accurate wattmeter will always show the true power consumed which takes into account the power losses due to the?
Wiki User
∙ 6y ago
I don't know which one it is a ,current spiking,,,,,,impedance matching,,,,,latent heat,,,,,,power factor
Wiki User
∙ 6y ago
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When voltage across a certain resistance is V the power delivered is P when the voltage is doubled to 2V what is the power?
First of all the power consumed is only dependent on the load (eg. any appliance) connected to the source. A load will always draw its rated power. If you have increased your voltage to twice then the current drawn by the device will become half but the power consumed will remain same.the power consumed is given by:P= V*I* cos(fi)here for a given load P(power), cos(fi) are constants.Then if V becomes 2V then current will be I/2.
Why is the electric watt meter connected in series with the rest of the circuits in the house?
First of all, you are referring to an energy meter, not a wattmeter. A wattmeter measures power, in watts, whereas an energy meter reads energy, in watt hours (or, more specifically, kilowatt hours). The energy company bills you for energy, not power.Having said that, the connections each instrument are the same. In fact, there are two coils inside an energy meter: a current coil, and a voltage (or potential) coil. The current coil is connected in series with the load while the voltage coil is connected in parallel with the supply voltage.The current coil measures the in-phase component of the current drawn by your load, so that the instrument always reads the true power (multiplied by time -the function of the aluminium disc) of the load -i.e. not the apparent power or reactive power.
Is it always better to take measurements with the most accurate instruments available?
Yes and NO, NO - there is no such this as 'The Most Accurate' because these machines holding the name are upgraded and fixed on a regular basis and all machines can go wrong. Yes - They are more detailed and will work better than older versions. e.g A earthquake predictor now shows tremor lines on paper, before that the Chinese has a statue with metal spheres in its mouth and was only good when there was an actual earthquake happening. I hope this answer has been of much use.
Is sizeof an operator or function why?
You cannot overload the sizeof() operator because that could introduce uncertainty in its evaluation. The sizeof() operator must always produce an accurate and logically predictable result, thus all user-intervention is completely forbidden.
Power consumed is measured in amperes?
Power consumption is measured in many different ways.Power is usually measured in WattsVoltage usually in VoltsResistance in Ohmsand Current (or flow rate) in AmpsGoogle for "Ohms Law"AnswerYou do not 'consume' power. Power is the rate at which work is done.
Why you use low power factor wattmeter on primary and unity power factor on secondary side of transformer?
There is no such thing as a 'low power-factor' wattmeter. A wattmeter always reads true power, regardless of the load's power factor.
Why watt-meter is required to measure real power delivered to a purely resistive load?
A wattmeter (not 'watt-meter') will always measure the true power of a load, regardles of whether that load is purely resistive or not. This is because a wattmeter effectively measures the in-phase component of the load current.
Are hospital pregnancy test always accurate?
No , they are about 99% accurate :)
Is Answers.com always accurate?
no.
Why does cereal have more nutrition facts than everything else?
Because cereal is almost always consumed with milk. So, if the nutrition label takes milk into account, giving the nutritious facts both with milk and without it.
Is wiki answers accurate?
Always.
Is eia always accurate?
according to WIKI, no
Why are forecasts not always accurate?
no one knows but them :)
What is effect of power factor on the readings of wattmeter?
If you are asking whether power-factor improvement has any effect on a wattmeter reading, then the answer is no, it doesn't. Improving the power factor of a load has absolutely no effect on the power of the load, but it can act to reduce the value of the load current.
Are the lists of calories in food always accurate?
For packaged foods, the calorie count is not always accurate. The FDA allows package labels to be off by as much as 20%.
Is feces always brown?
No, it can change color based on food digested or chemicals consumed.
Why do you use two phase watt meter?
You may be thinking of the 'two-wattmeter method' for measuring three-phase power?As a rule, it's always possible to use one less wattmeter than the number of conductors supplying a three-phase load to measure the power of that load. So, for a three-phase, three-wire, system, two wattmeters may be used to measure the total active power of the load -regardless of whether the load is balanced or unbalanced. The algebraic sum of the two wattmeter readings will give the total power.
