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Device that produces current by moving a magnetic field across a wire?
Wiki User
∙ 9y ago
An electrical generator does that.
Wiki User
∙ 9y ago
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What happens when a wire is looped into a coil?
When you wind a current carrying wire into a coil, it causes the concentration of the magnetic field line to intensify. Depending on which pole of the magnet is in the up position, the wire will move towards or bend away from it.
How electricity generated in dyanamo?
A dynamo is an electric generator. The basic principle is that, when a wire (or any conductor, for that matter) moves through a magnetic field, a voltage is is induced across the wire. This will cause current to flow.
Why ph meter should be calibrated before use?
Analog Ohmmeter is a magnet device. Small coils are wound against the base of a needle. Magnets surround these coils. A voltage is applied across your device to determine the current flow of the resistive device. The more current that passes through the device under test the more magnetic field that is produced. The stronger the magnetic field the further the needle will move. The further this needle moves the lower the resistance. The ohmmeter can pick up external magnetism from various sources. Because of the small voltages applied this movement is very sensitive to these stray fields. The adjustment compensates for these errors. The ohm meter has its own internal battery supply. As the battery voltage drops the adjustment is used to compensate to keep the needle on zero, circuit open. When the needle can not be adjusted due to low battery voltage it is time to put in a fresh battery.
Does magnetic force pass through iron?
Magnetic force fields will pass through any material that is Not Magnetic itself, and does not have a magnetic field in it or surrounding it (like a wire carrying a current). When a magnetic field encounters a magnetic material the field is contained by it. This is the purpose of a "KEEPER", a metal bar that is placed across the Poles of a Horseshoe magnet. It 'Keeps' the Field in the magnet so to speak. This helps maintain the magnets strength.
What is magnetic keeper?
A magnetic keeper, also known as a magnetic shunt or magnetic loop, is a piece of ferromagnetic material that is used to enhance and maintain the strength of a magnetic field. It is typically placed across the poles of a permanent magnet or an electromagnet to prevent the loss of magnetic strength when it is not in use or being used for a specific purpose. The magnetic keeper helps to redirect and concentrate the magnetic flux within the magnet, prolonging its effectiveness.
How do power transformers work?
An inductor is a spirally wound coil that produces a magnetic field when the current passing through it is changed. The magnitude of the magnetic field depends upon the amount of change in the current per unit time, number of turns in the coil, and the material of the coil. Conversely, when magnetic field across an inductor is changed, it produces a current. When two inductors are placed close to each other and a current is passed through one of them, we can have an arrangement in which we apply a particular voltage across one conductor and get a different voltage across the second inductor. Such an arrangement is called a power transformer.
What are the similarities between WD 40 and a light bulb?
There are no similarities between WD 40 lubrication oil and a device that produces visible light when a current is applied across its filament load.
What are the similarities between WD-40 and a light bulb?
There are no similarities between WD 40 lubrication oil and a device that produces visible light when a current is applied across its filament load.
What is the process called in which a conductor cuts across a magnetic field and produces a voltage?
We call it induction when we pass a conductor through a magnetic field to produce voltage.
What kind of movement creates electrical energy?
Movement of a wire in a magnetic field. If a loop of wire is moved in a magnetic field, it produces a voltage across its ends that can be measured on a voltmeter, resulting from the change in the magnetic flux linking the coil. If a resistor is connected across the ends, a current will flow and a force is needed to move the wire in the magnetic field. The energy supplied by the movement of the coil appears as electrical energy in the resistor, heating it up. That is the principle of an electric generator.
Why electronic equipments get damaged in electro magnetic field?
Answer: a changing magnetic field results in an emf, and that is basically the principal of electromagnetic induction. This means that if you pass a magnetic field across a conductor, it will induce a current in that conductor. A piece of electronics is often a semiconductor that is designed to have an exact amount of current flowing through it, and no more. If you pass a magnetic field near the semi-conductor, it may induce a current in that conductor greater that the maximum that the device was designed for, and this could result in that devices break down. The same is true of hard disk drives, accept in the case of a hard drive (magnetic storage), the device uses magnetic media to store information, and passing a magnet near it will erase the information. A common place for magnets to be found is in speaks systems.
What is surface leakage current?
Undesired current flow across the surface of a semiconductor device due to contamination of that surface. This disturbs the operation of the device and causes a variety of failures. Insulators can also have surface leakage current for similar reasons.
Moving a magnet in and out of a coil of wire produces?
That will induce a voltage across the wire.
Ac voltage applied across a load resistance produce alternating current?
The reason an AC voltage applied across a load resistance produces alternating current is because when you have AC voltage you have to have AC current. If DC voltage is applied, DC current is produced.
What is the Ratio of potential differences across a device to the current that passes through it?
the ratio would be 2:1.
Why transformer action can take place in DC and ac circuit?
First understand that every electrical conductor (wire) with current flow through it will produce an invisible magnetic field around it. This field is directly proportional to the magnitude of current flowing. Second (and inversely) realize that any conductor moving through a magnetic field will produce a voltage, And if provided with a complete circuit (a path to flow in) will result in current flow in that conductor. The movement can be from the conductor moving, or from the magnetic field moving, as long as there is 'relative motion' between the conductor and the magnetic field. In short, a conductor with current flow produces a magnetic field , a conductor and a magnetic field with relative motion between them produces current flow. (This is also the basis for how a motor works) AC means 'Alternating Current'! The current flow moves in one direction along a conductor, then reverses to zero and to equal magnitude in the opposite direction. Each time this current changes direction it produces a magnetic field, as it returns to zero the field collapses. As the current builds in the opposite direction the magnetic field builds again. In an AC transformer circuit, two conductors are placed in close proximity to each other and an alternating current is applied to the first conductor. This alternating current causes a magnetic field to build around the conductor, then collapse, build again in the opposite polarity and so on. This expanding and collapsing magnetic field creates relative motion between the field and the second conductor which then produces current flow of its own. This is called "transformer Action". In steady state DC circuits, the magnetic field is constant and there is normally no relative motion, therefore no "transformer action". There is however still a relative motion created when the circuit is first energized, and when it is de-energized. This collapsing field is how the ignition coil in your car works. In the simplest form, contacts (points) were opened by a cam, the open contacts de-energized the first conductor (the 12VDC primary). The resulting collapsing field cut across the secondary conductors. Because these conductors were wound into many turns or "coils" it actually multiplies the effect producing a high voltage in the secondary (connected to the ignition wires). This produced a voltage and current strong enough to jump across the gap of a spark plug. And, Yes Virginia, there is such a thing as a DC transformer.
How would you connect a voltmeter?
A: It must be connected across the device ammeters cannot measure DC current directly
