Question

The core of transformer is laminated because

• A. the weight of the transformer may be reduced
• B. rusting of the core may be prevented
• C. ratio of in primary and secondary may be increases
• D. energy losses due to eddy currents may be minimised

Answer 1

Answer: (D)

energy losses due to eddy currents may be minimised

The core of the transformer is laminated to reduce these to a minimum as they interfere with the efficient transfer of energy from the primary coil to the secondary one. The eddy currents cause energy to be lost from the transformer as they heat up the core - meaning that electrical energy is being wasted as heat.