Question

A transformer's core is laminated to minimize weight.

• A. Flux leakage
• B. Output power
• C. Hysteresis
• D. Copper loss
• E. Eddy current

Answer 1

The correct option is E

Eddy current

Explanation for the correct option

In the case of option E,

1. According to Faraday's law of induction, eddy currents are loops of electrical current induced within conductors by a changing magnetic field.
2. The transformer's core is laminated to reduce eddy current and improve efficiency.

Explanation for the incorrect option

In the case of option A,

1. In a magnetic circuit, leakage flux refers to the portion of magnetic flux that does not follow the desired path.
2. The path of a substantial part of the magnetic flux in most practical magnetic circuits is through the iron part of the magnetic circuit, while the rest flows through the air.

In the case of option B,

1. The product of the motor's torque and the angular velocity of its output shaft determines the output power of the motor.

In the case of option C,

1. Hysteresis is a term that refers to a lag between input and output in a system when the direction changes.

In the case of option D,

1. Heat created by electrical currents in the conductors of transformer windings is referred to as copper loss.
2. It's a wasteful energy transfer caused by induced currents in nearby components.

Hence, the correct option is (E).