A transformer cannot work on DC. Why?

A transformer working on a 240 V AC supplies 12V. The number of turns in the primary coil is 1000. Calculate the number of turns in the secondary coil.

A transformer without power loss carries 4000 turns in the primary and 2000 turns in thw secondary. If the primary voltage is 120 V and the current is 0.2 A . Where are the thick wires to be used in this transformer - in the primary or secondary ? why ?

Magnetic force cannot do any work Do you agree with this statement? Justify your answer.

A.C. adaptor converts household ac into low voltage dc. A stepdown transformer is a essential part of ac adapterWhat is the use of step down transformer?

Thickness of insulated copper wire used in ihe primary turns and secondary turns ofa transformer are not equal. Write down the working principle of transformer.

The figure shows a liquid placed on the pole pieces of two magnets. Does this behaviour transform with temperature. Why?