What type of wave is produced by alternating current?

• A. Square
• B. Sine
• C. Triangular
• D. Pulsating

Answer: (B)

When alternating current (AC) is generated, it produces a waveform that is typically sinusoidal in shape, known as a sine wave. This waveform is characterized by its smooth, periodic oscillation above and below a central axis, representing the continuous change in direction and magnitude of the current.

The sine wave occurs naturally in systems that oscillate, making it a fundamental waveform in electrical engineering and physics. AC systems are designed around this sine wave because it allows for efficient energy transmission and distribution. As the current alternates, it continuously changes direction, which is why the waveform is a smooth curve rather than abrupt transitions.

In contrast, other waveforms listed, such as square, triangular, or pulsating waves, do not typically represent standard AC supply. Square waves, for instance, switch abruptly between high and low states, while triangular waves ramp up and down linearly. Pulsating waves might be likened more to certain forms of DC or modulated signals, rather than the continuous oscillation characteristic of conventional alternating current.

Therefore, the sine wave accurately captures the behavior and characteristics of alternating current, making it the correct answer in this context.