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To generate an alternating current, a magnet must use kinetic energy. This means that the magnet must move at a certain speed and velocity in order to create a strong enough energy charge.
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What type of voltage must be passed across a transformer?
A transformer must be connected to an alternating current (AC) supply of the correct voltage.
What must a magnet always have?
A magnetic field.
Dose electricity create magnets or do magnets create eletricity?
Yes.A moving magnet inside a coil of wire creates electricity, however, a magnetic flux is produced by an electrical current. Many experiments are described on the internet regarding a current and iron filings to determine the magnetic flux.
What is the direction of the electric current in ac?
No. The direction of the current is constantly changing, reversing direction at twice the "frequency" of the AC. For house-current in the US, that means it reverses direction 120 times every second. That's why it's called "alternating".
Formula between Current and luminous intensity?
Any formula relating those two quantities must depend on the technique used to generate light by means of electric current. We know that there can't be one universal formula because, for example, we know that a compact fluorescent lamp uses less current to produce more luminous intensity than an incandescent lamp.
What is type of current that transformers require to operate?
As a transformer requires an alternating magnetic flux within its core, then the current flowing in its primary winding must be alternating.
What is the best electric current?
This depends upon the application. For most home appliances and industrial machinery, alternating current is the best electric current. In most computer electronics, alternating current must be converted into direct current.
Why must you make a magnet by using batteries?
because battery supplies a direct current and to make a magnet with using the electrical method you need to supply direct current to the material {metal}which must be wounded with a coil {solenoid}.
Why are cryogens used in mri?
To keep the magnet cool. MRI machines need to generate a very strong magnetic field. They do this using superconducting electromagnet- basically a large coil of wire with a large current passing through it. The magnet must be kept very cold, almost at absolute zero, or it will not superconduct.
What type of voltage must be passed across a transformer?
A transformer must be connected to an alternating current (AC) supply of the correct voltage.
Why are most chargers very inefficient?
Voltage must be changed by a transformer, and the alternating current changed to direct current by diodes. Each step has a loss of energy.
How do you measure alternative current using ac ammeter?
I think you mean 'alternating' current ('alternative' means choice). The ammeter must be inserted in series with the load, just as with direct current.
In which case will electric current be induced in a coil of wire?
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.
Why must you use ac current for transformer?
Transformer is based on the principal of mutual inductance.Induction is produced due to sinusoidal wave form thats why we use Alternating current inspite of Direct current.
What is alternating current and give examples for this?
Alternating Current( AC ) constantly reverses itself as a result OS reversing electromotive force.One complete reversal is a cycle,and the number of cycles per second is the frequency of alternating current .The standard frequency of alternating current in the United States and the rest of North America is 60 Hz(1 Hz or hertz,equals 1 cycle per second )ex...Transformer,AC generator
How to demagnetize a magnet?
A magnet is an object that has a magnetic field. The word magnet comes from the Greek "magnítis líthos" (μαγνήτης λίθος), which means "magnesian stone". Magnesia is an area in Greece (Now Manisa, Turkey ) where deposits of magnetite have been discovered since antiquity. Permanent magnets can be demagnetized in the following ways: ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ * Heat. Heating a magnet past its Curie point will destroy the long range ordering. * Contact. Stroking one magnet with another in random fashion will demagnetize the magnet being stroked, in some cases; some materials have a very high coercive field and cannot be demagnetized with other permanent magnets. * Hammering and/or Jarring. Such activity will destroy the long range ordering within the magnet. * Being placed in a solenoid which has an alternating current being passed through it. The alternating current will disrupt the long range ordering, in much the same way that direct current can cause ordering. In an electromagnet, ceasing the flow of current will eliminate the magnetic field. However, a slight field may remain in the core material as a result of hysteresis.
How do transformers work since the two coils aren't connected to each other?
The AC - and it must be AC - in the primary coil generates an alternating magnetic field around the coil; this alternating magnetic field induces a current in the secondary.
