Due to the steel must have axes. Magnetic flux so that it passes from the primary coil to the secondary coil is heating occurs within an iron axis. Because while the magnetic flux from the primary winding through a steel coil axis as the secondary will be induced electricity occurred in the steel axis. Which is called the iron axis Eddy heat. So the power output from the secondary winding is less than the primary winding power always. To reduce the loss of energy as the ancient heat energy in the iron core due to the Eddy. It has a steel core, design power induction occurs, the minimal. This is done by using several sheets of soft steel sheet and steel plate with a thin insulating barrier between each pair of iron bars instead of the whole scan. Good quality transformer, there is little heat, it happens.
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