What are current coil and pressure coil?
These terms apply to the coils inside a wattmeter. 'Pressure coil' is an archaic term for 'voltage coil', which is connected in parallel with the supply, while the 'current coil' is connected in series with the load.
Current coil carries the current. Read More
difference bwtween current coil & potential coil Read More
A CT doesn't have a 'pressure coil'! Reword your question. Read More
A 'pressure coil' is an archaic term for a 'voltage coil' (UK terminology) or 'potential coil' (US terminology), as opposed to the 'current coil' in a wattmeter. This coil is connected in parallel with the supply, while the current coil is connected in series with the load. Read More
The electronics shuts off the current to the coil and injectors are usually under pressure so when there is no current in the coil the force of back pressure shuts the injector. -_- max Read More
pressure coil or voltage coil across the supply and the current coil in series. Read More
You have to connect both coils to measure power: the current coil in series with the load, and the voltage ('pressure') coil in parallel with the supply. And you have to observe the wattmeter's polarity markings if you don't want it to read downscale (backwards)! Read More
In an analog induction type wattmeter the pressure coil is connected accross the voltage source.It is intentionally made to have a larger number of turns than the current coil so that it's impedence increases and it draws minimum current from the circuit; causing lesser error in the reading. Read More
How the current and pressure coils of the wattmeer are connected in circuit to measure the power drawn by load?
The current coil is connected in series with the load. The voltage coil (the term, 'pressure coil' is rather archaic!) is connected in parallel with the load. The wattmeter's polarity markings must be taken into account, or the meter will read downscale (backwards). Read More
The voltage coil refers to the voltage across the coil while the current coil refers to the current passing the given coil. Read More
The current coil is one through which the current of source can pass. This coil is connected in series. The voltage coil is connected parallel to the applied voltage. In the current coil the quantity of current flowing is proportional to the current flowing in load while in the voltage coil, current flowing is proportional to applied supply voltage. The voltage coil current is independent of current flow in load. For a complete understanding, please… Read More
In some energy meters, the disc rotates slowly and continuously when there is no load.the rotation of disc without any current through current coil and only due to excitation of pressure coil is called creeping. Read More
The current coil is the amount of current passing through a given coil. The voltage coil is the potential difference developed across the coil. Read More
What is the current in the secondary coil fi the current in the primary coil is 5.0A 10 loops on primary coil and 20 on secondary coil?
The secondary current depends upon the load, not the primary current. Once you know the secondary current, you can then work out the primary current. Read More
You mean the phenomenon of electromagnetic induction. As the magnet and coil are at rest relatively then no induced current in the coil. So current disappears, Read More
The coil offers some amount of Resistance to the flow of Electric current through the coil. The Resistance of the coil depends on the material used to make the coil and the thickness of the coil wire ( its gauge ) When a current flows through the coil, the voltage drop across the coil and the Power dissipated in the coil both are proportional to the magnitude of current and the coil resistance. Normally the… Read More
When the current in a nearby coil changes, the magnetic flux associated with it changes and an induced emf is produced in the other coil.Hence, induced current is produced. Read More
The exceptionally strong and steady magnetic field reacts with the alternating field created by the alternating current produced by the audio current flowing in what is known as the voice coil. The Voice Coil is physically attached to the cone that moves the air so you can hear the pressure wave that simulates the current wave-form. Read More
A magnetic field is generated around the coil when a current is passed through a coil of wire. Read More
A: A speaker has a magnet and the wire is suspended in a zone by a cone whereby +/- current will make the coil move up or down moving the coil and moving the cone causing air displacement as waves of pressure that our ears can detect as sounds in our brains. Read More
The wattmeter contains two coils one is current coil and other is pressure coil. the current coil is connected in series with the line and pressure coil is connected across the supply. so, the disc links with the flux which is the resultant of these two.(resultant means consider the vector resultant), which include phase angle also. the active power P=VI(cosine of angle between v & I). there fore the wattmeter measures the active power. Comment… Read More
You obviously cannot more a magnet through a coil in the direction of the current, because the magnet must move, axially, along the length of the coil, while the current moves radially, around the coil. However, if you move a conductor within a coil carrying a d.c. current, then the magnet will induce a voltage into that coil which will oppose the voltage applied to the coil. Read More
BACK emf induced in a motor's coil that tends to reduce the current in the coil of the motor. The answer should be 'back'. Read More
Explain Why it is important that the current in the coil of a motor changes direction every time the coil makes a half revulotion?
due to commutation the current in the coil reverses Read More
compressing a coil in a magnetic field means that there is a relative movement of the the said coil existing in a magnetic field, hence current will be induced. induction law. Another Answer 'Current' is not induced into a coil. It's voltage that's induced; if the coil forms a closed loop, then current will flow; if there is no closed loop, then no current will flow. The induced voltage results from either a change in… Read More
Current is not induced into a coil. It's voltage that is induced into a coil. If the coil is connected to a load, or even short circuited, then a current will flow as a result of the induced voltage -but it's the voltage, not the resulting current, that's induced! Voltage is induced into a coil because the the changing magnetic field, due to the change in current (0 to Imax or vice versa) applied to… Read More
Different ways to induce current in a coil are as given below: (1) If a magnetic field is changed round a coil then an induced current is set up in the coil. It can be done by taking a bar magnet and bringing it closer to the coil or taking it away from the coil. (2) If a coil is moved in a magnetic field, then again an induced current is set up in the… Read More
Current will try to flow when the coil moves across the earth's magnetic field. The current will only be able to flow if the ends of the coil are connected together. Read More
The coil must experience a changing magnetic field in order to have a current induced. You can rotate the coil between the poles of a magnet, or rotate the magnet around the coil. Read More
A generator moves a coil of wire through a magnetic field and that induces a current in the coil . Read More
It's an archaic expression, which is not usually used these days. But 'voltage' was considered to equate to 'pressure' in, say, a hydraulic system. So the term pressure (as well as 'tension') has, in the past, been used in place of 'voltage' or 'potential difference', as in 'pressure coil' or 'high-tension transmission'. In North America, a 'voltage coil' is frequently termed a 'potential coil'. Read More
A coil (assuming an electro-magnetic coil) is an inductive-type load, since the work being done does not depend on the resistance (likened to pressure) of the conductors, rather the current (likened to volume) of the conductors. Another Answer A coil has both resistance and inductance, therefore a coil is classified as a 'resistive-inductive' (R-L) load. Read More
If the magnetic field is fluctuating, or the coil of wire and magnetic field are moving with respect to each other, then a current is induced in the coil of wire. If the two are stationary and the magnetic field is stable, then no current is induced in the coil. However, if there is a current in the coil, from another source, then the coil and the field will exhibit a relative force that will… Read More
Its function is to increase current. If this coil gets damaged then it has to be changed. Read More
In 3 ways: By moving the coil in a magnetic field, by moving a magnetic field relative to the coil, or by supplying alternating current in a one coil and placing a second coil in the first's magnetic field. The first is the principle of the dynamo and the third the principle of the transformer. Read More
Can a watt meter that has current through its current coil and a potential across its voltage coil indicate zero?
A watt meter that has current through its current coil and voltage across its voltage coil will indicate zero if the power factor between the volts and amps is zero. This condition would be one in which the current will either lead or lag the voltage by 90 degrees and the circuit will have amps, volts, VARS, and VA, but will not have Watts. Read More
If dc current is passed through a single coil, it is going to remain constant. Read More
Whenever a conductor passes through a magnetic field, a voltage (not current!) is induced. Read More
cutting through magnetic lines of force produce electric current. Read More
... exhibits a voltage between its ends. If there is a conductor between the ends of the coil, then a current flows in the coil. Read More
doubled Read More
There is no such thing as an 'induced current'. Voltages are induced, not currents. If a voltage is self-induced into a coil, then that voltage will oppose any change in current. If a voltage is mutually-induced into a separate coil, no current will flow unless that coil is connected to a load. Read More
Because inductance is only related to alternating current. Direct current doesn't induce eletrical current on a secondary coil placed on a primary coil, because there is no frequency generated by direct current, and all you get is a single electrical current flowing through the wire without interfering with a coil placed near to the primary coil. What makes all the difference is the cycles per second that only alternating current can generate. Read More
A moving-coil ammeter is an analogue ammeter, used to measure direct current. It works on the same principle as an electric motor, whereby a pivoted coil, located between the two poles of a horseshoe magnet, will rotate when current is passed through it. The movement is restricted by a pair of hairsprings, which means that the moving coil will move through an angle that is proportional to the current. A pointer, attached to the coil… Read More
A current would be induced in the coil. Read More
Because in the coil DC current follow easly and pmmc meter is making with coil and AC current is not follow in coil so we used the pmmc only fpr DC current. Read More
The strength of an electromagnetic is determined completely by the current through its coil, and doesn't depend on the voltage across the coil. The voltage will be (current) x (resistance of the coil). Read More
If alternating current is impressed on one coil what will be the frequency of the induced voltage in another coil with which it is coupled?
Same frequency as that of primary coil Read More