What is the purpose of the iron core in a transformer?
What is the purpose of the iron core in a transformer?
An iron core, also called a magnetic core or magnetic core, is a component for producing inductance, a property that has electrical circuits or components such as coils. It is therefore also used in transformers. Electromagnetic induction causes an electric field by changing the magnetic flux density.
Why is an iron core used in a transformer GCSE?
the iron core increases the strength of the magnetic field. the changing magnetic field induces a changing potential difference in the secondary coil. the induced potential difference produces an alternating current in the external circuit.
Why do Transformers only work with AC GCSE?
As a direct current is constant, the magnetic field produced would not move and the field lines would not intersect the secondary wire resulting in no induction of EMF or current. Therefore only an alternating current works in a transformer.
What is the purpose of a step up transformer in the national grid?
In the National Grid, a step-up transformer is used to increase the voltage and reduce the current. The voltage is increased from about 25,000 Volts (V) to 400,000 V causing the current to decrease. Less current means less energy is lost through heating the wire.
How does a transformer work using electromagnetic induction?
Transformers contain a pair of windings, and they function by applying Faraday’s law of induction. AC passes through the primary winding, which creates a varying magnetic flux. The magnetic field that results strikes the second winding and generates an AC voltage in that winding via electromagnetic induction.
What is VP vs NP NS?
3. In a transformer Np / Ns is called the voltage ratio. If Ns is less than Np then Vs is less than Vp. This is called a step-down transformer as the voltage is reduced. If Ns is greater than Np then Vs is greater than Vp.
What is induced in the core of a transformer?
In a transformer, the magnetic flux created by the primary coil induces a current in the core. This occurs in order to oppose the charge that produced the magnetic flux (Lenz’s Law). The currents flowing in the core are called eddy currents.