What is current induction in electrical terms?

• A. A discharge of static electricity in the airframe.
• B. An electrical current being induced into, or generated in, any conductor that is crossed by lines of flux from any magnet.
• C. A constant voltage supply from the aircraft's power system.
• D. A battery charging process.

Answer: (B)

Current induction happens when a changing magnetic field causes electrons in a conductor to move, producing an electric current. This follows Faraday’s law: a varying magnetic flux through a conductor induces an electromotive force, driving current in a closed loop. The description that current is induced into or generated in a conductor when it is crossed by lines of flux from a magnet matches this idea exactly, because it captures both the presence of a magnetic field and the dependence on changing or crossing flux.

In a practical sense, aircraft generators work on this principle—the rotating parts create changing flux in the windings, which induces current. The other options describe different electrical phenomena: static discharge is a brief, surface phenomenon, not a continuous induced current; a constant voltage supply is a power source rather than induction; and a battery charging process is energy transfer from a source to a battery, not the induction mechanism itself.