How is induced current in a secondary coil related to current in a primary coil and explain its principle?

An alternating current passes through a primary coil wrapped around a soft iron core. The changing current produces a changing magnetic field. This induces an alternating voltage in the secondary coil. This induces an alternating current (AC) in the circuit connected to the secondary coil.

Why current is less in step-up transformer?

Although the voltage increases in a step-up transformer, the current is reduced proportionately. A transformer transfers power from the primary coil to the secondary coil. Since the power must stay the same, if the voltage increases, the current must decrease.

Which coil winding has more resistance primary or secondary?

The primary will have proportionately more turns so that will add to its resistance. And since the secondary current will be higher the secondary would typically have larger gauge hence lower resistance windings. So overall the primary would have a higher DC resistance than the secondary.

What is the current in the secondary coil?

There is no induced current once the switch is left either open or closed. That is, for a steady current in the primary coil, there is no current in the secondary coil.

What is a secondary coil?

Noun. 1. secondary coil – coil such that current is induced in it by passing a current through the primary coil. secondary winding, secondary. coil – reactor consisting of a spiral of insulated wire that introduces inductance into a circuit.

Why is current induced in secondary coil?

When the current changes in the primary coil then the magnetic field is induced in the primary coil and which get associated with the secondary coil through a metallic core. Due to the change in magnetic field across secondary coil, a current is induced in the secondary coil.

Do step down transformers reduce current?

A step-up transformer increases voltage and decreases current, whereas a step-down transformer decreases voltage and increases current.

Which winding of the transformer has less area?

High voltage winding carries a lower current and hence the resistance of winding is more. As the resistance of winding is inversely proportional to the area of cross-section, the area of high voltage winding is less compared to low voltage winding.