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AC source of electric power changes changes polarity constantly, in amplitude.
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∙ 9y ago
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How can the direction of rotation of a DC shunt motor be reversed?
DC shunt motor can be reversed by changing the polarity of either the armature coil or the field coil.
How do technology change supply?
It changes supply by how much is bought. The more technology that is bought, the less supply there is. The less that is bought, the more supply there is.
How do you check the polarity on a car speaker?
With a simple flashlight battery.Connect wires to the speaker then breifly touch the wires to the battery and watch the speaker.If you have positive to positive and negative to negative the speaker will "push outwards" if you have it reversed it will "suck inwards"
What is DC source rating?
a constant amplitude supply
What is polarity therapy?
A polarity test is used to find out the electrical polarity (positive or negative) of the voltage at a given point within a circuit relative to some other point. Most multimeters, including digital multimeters, can do this.Answer regarding alternating currentIn the context of an a.c. supply, a polarity test is done to ensure that the line and neutral conductors are connected the correct way around at, for example, electrical sockets, Edison-screw lamp holders, etc.
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 .
Why water supply does not freeze in cold weather?
the source is constantly in motion friction heat is iven of prevent vander waal forces
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'.
Why can not you store AC power in battery like DC power?
Because ac is of changing polarity. It means the positive terminal becomes negative and vice versa... And this happens 60 times a second! So if we want store this, the terminals of the battery should be changed at the same speed as that of the supply which is not practicable ( and in theory it can be done by a electronic switch which constantly changes its polarity). So its better to convert this ac to dc, store it and then again to ac as in the case of a UPS.
What are examples of the terms trigger supply source of narcissist supply and narcissist supply?
1. The trigger of supply is the person or object that provokes the source into yielding narcissistic supply by confronting the source with information about the narcissist's False Self.2. The source of narcissistic supply is the person that provides the narcissistic supply.3. Narcissistic supply is the reaction of the source to the trigger.
What is an example of reverse polarity?
Reverse polarity means connecting a power source, or polarised componenet, with the positive and negative poles the wrong way round. If the positive and negative supply is connected the wrong way round in electronic devices, it usually causes damage, because semiconductors are sensitive to polarity. Sometimes protection is provided, so that reverse polarity stops the device from working without causing damage. Connecting a diode (or rectifier) in reverse, will block the flow of current, without causing damage and is useful in protecting circuits from reverse polarity. In some consumer electronics (especially CB Radios) the power input has a recitifier across the 12v supply. If it is wired correctly, the rectifier is in reverse polarity, does not conduct and allows the radio to work. If you reverse the polarity of the power supply, the rectifier is now in full conduction, across the supply, causing a dead short. This shunts any power away from the radio and blows the fuse in the line, thus protecting it.
Why use blocking diode across the relay coil?
Coils have the strange property that when electricity is released from them, they reverse polarity and spike the remaining current back towards the source. The diode is there to "block" this from hitting the power supply and potentially causing damage.
How is quantity affected by price changes?
supply elasticity
What changes the equilibrium quantity to change?
It changes when the market demand and or market supply changes.
A graph example of supply increase without changes in demand?
If a seller increase supply without changes in demand, his business will not last. He will have more supply than demand.
How do you protect drinking water from pollution?
Constantly test the municipal supply.
What is the source of electricity in the electromagnets?
The source for an electromagnet can be any electrical supply. Batteries or derived from the mains, using a transformed and rectified supply.
