The resistance to the electric flow through the wire coil causes heat
the heat formed in the core due to the "eddy currents" burns a transformer
To reduce heat generated and eddy current losses in transformer's core during operation.
Laminated steel plates.
500w iron core transformer .that kind of size
Transformer cores are made up of insulated laminations to cut down on eddy currents induced in the core, which is an unwanted power-loss.
because it generate heat
All transformers produce some heat, and reducing the heat is an design aim in transformers because heat, like all energy, costs money. Heat losses can be reduced in a transformer by using thicker copper wire in the windings and a thicker iron magnetic core. Obviously there is an optimum somewhere in the middle that transformer designers aim for.
It is the current transformer core meant for metering.
The main application for a core type transformer is to increase voltage from a standard 240v supply up to 415v instead of using a 3 phase supply.
It is because if we use a plastic as a core of the transformer then induced emf can to be produced also generated heat will damage the plastic .
A 'core type' transformer core is one in which the primary windings and secondary windings are placed around each of the limbs, as opposed to a 'shell type' core, in which the two windings are placed across the centre core. A core-type core is a magnetic circuit equivalent to an electric series circuit, whereas a shell-type core is equivalent to an electric parallel circuit. This is better answered with a diagram, so I suggest that you do a search on the internet.
AL means transformer core property