Question

an electric generator produces electricity by ________.
passing a current through a wire wrapped around another wire within an alternating magnetic field
inducing a voltage in a wire by rotating an axle wrapped in wire within a magnetic field
stripping the electrons off of the hydrogen in gasoline or other fuel sources and sending them into a wire

Explanation:

An electric generator operates based on the principle of electromagnetic induction. When a conductor (wire - wrapped axle in this case) rotates within a magnetic field, a voltage is induced in the wire. This is the fundamental working principle of generators.

• The first option is incorrect because passing a current through a wire in a magnetic field is more related to the operation of a motor (where electrical energy is converted to mechanical energy) rather than a generator.
• The third option is incorrect as it describes a process that is not related to the standard electromagnetic induction - based operation of a generator. Stripping electrons from hydrogen in gasoline is more relevant to fuel - cell or some chemical - based energy conversion processes, not generators.

Answer:

inducing a voltage in a wire by rotating an axle wrapped in wire within a magnetic field