Examkin

Question

Difficulty: EasyElectromagnetism and Induction

A transformer can continuously induce a voltage in its secondary winding when powered by a steady, unchanging direct current (DC) source.

Answer: Answer

Answer

False
The statement is false because continuous electromagnetic induction requires a time-varying magnetic flux. A steady DC current produces a stationary, unchanging magnetic field, resulting in zero continuous induced voltage across the secondary winding.

Step-by-Step Solution

1
Analyze the electrical power source and component operation described in the statement.
The statement specifies applying steady, constant direct current (DC) to the primary winding of a transformer to produce continuous secondary voltage.
Transformers rely on mutual electromagnetic induction between primary and secondary windings.
2
Evaluate the condition required for continuous electromagnetic induction.
Faraday's law of induction dictates that induced voltage is directly proportional to the rate of change of magnetic flux (ΔΦ/Δt\Delta \Phi / \Delta t). A steady DC source produces a constant magnetic field (ΔΦ/Δt=0\Delta \Phi / \Delta t = 0), meaning no continuous voltage is induced.
Continuous induction requires a continuously changing current and magnetic flux, such as alternating current (AC).

Key Concept

Electromagnetic induction in transformers requires a time-varying magnetic flux, meaning a steady direct current (DC) cannot maintain continuous secondary induction.
Estimated Time:45s
Rate this question

Topics

Electromagnetism and Induction

More questions from this topic