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To ensure that the relative directions of the current passing through the current and voltage coils result in the meter reading 'upscale'.
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Write down the advantage of 2-wattmeter method instead of 3-wattmeter method for measuring ac power?
It's cheaper.
Do ac capacitor have polarity?
no
Why wattmeter shows negative reading during no load condition of 3phase ac induction motor?
no load means the motor is acting like a coil
Which supply has polarity AC or DC?
DC has polarity, while AC is constantly reversing in polarity.AnswerWhile the previous answer is quite correct in the sense of 'positive' and 'negative' charges, it's worth pointing out that 'polarity' has a second meaning in a.c. systems. In a.c., the term 'polarity' is used to describe the correct connection of the supply's line and neutral terminals. For example, with an Edison screw lamp holder, to remove the risk of shock, it's important that the line conductor is connected to the centre terminal, and the neutral conductor is connected to the outer terminal. If this has been done correctly, then we say that its 'polarity' is correct. Similarly, if the terminals of a socket outlet (receptacle) are connected the correct way around, then their 'polarity' is correct. Testing for the correct connections in an a.c. electrical system is called a 'polarity test'.
Is output of astable multivibrator using 555 AC or DC?
it's ac; astable multivibrators are unstable in both of their two states, so they switch back and forth, switching the polarity of the circuit.
What is ac wattmeter?
nothing
Is wattmeter is work on ac or dc?
this works with both.
Write down the advantage of 2-wattmeter method instead of 3-wattmeter method for measuring ac power?
It's cheaper.
Do ac capacitor have polarity?
no
Why ac current attract?
As we touch an ac supply in which due to body resistance , we create a phase difference between the ac supply and us . As ac reverses polarity , so do we , but our polarity change is opposite to that of the polarity change of ac supply , hence our body gets attracted to the ac supply .
Which current is having high polarity?
ac(Alternating Current ) has the high polarity.
Why is the lead polarity not significant when measuring AC voltage?
Because the polarity is changing at a 60 Hz rate. Hence the world alternating in AC.
Do ac capacitor have positive and negative polarity?
both
How do you reverse polarity on ac motor?
Reversing polarity is not possible with an ac motor. Some do have wiring that will allow you to change rotation. The type and model of the motor can tell you if it is reversible.
Why cannot store the ac power in battery?
Because batteries have fixed polarity, whereas AC requires that the polarity is switched, normally 50-60 times per second.
Which supply source changes the polarity constantly?
AC source of electric power changes changes polarity constantly, in amplitude.
How do you select polarity doing E6013?
You can weld with E6013 using any polarity. Use DC - or AC for thin sheet metal. Use AC if you have arc blow problems. DC - has the lowest penetration DC + has the most penetration AC splits the difference
