Final Answer:
Alternating current is normally produced by a generator, so the correct answer is B.
Step-by-step explanation:
Alternating current (AC) is a type of electric current in which the direction of the flow of electrons periodically reverses. AC is commonly generated by devices known as generators. Generators convert mechanical energy into electrical energy through the principle of electromagnetic induction. As a coil of wire rotates within a magnetic field, it induces an alternating current in the wire. This process is fundamental in power generation, as it allows for the efficient transmission of electricity over long distances.
In contrast, batteries produce direct current (DC), where the flow of electric charge is unidirectional. DC is commonly used in low-voltage applications, such as powering electronic devices. The option "C. battery" is incorrect in the context of generating alternating current. Therefore, the correct answer is "B. generator," as generators are specifically designed to produce alternating current, making them crucial components in power plants and various electrical systems.
Understanding the distinction between AC and DC, as well as the mechanisms of electricity generation, is fundamental in the field of electrical engineering. The use of generators to produce alternating current has been a cornerstone of electrical power systems, facilitating the distribution and utilization of electricity for various applications in homes, industries, and businesses.