Correct option is B
Correct Answer: B the direction of current as well as magnitude changes with time
Explanation:
In an alternating current (AC), both the direction and the magnitude of the current vary sinusoidally with time. This is the key characteristic of AC, as opposed to direct current (DC), where the current flows steadily in one direction with a constant magnitude. The change in direction and magnitude of AC is what enables it to be used efficiently in power distribution systems, transformers, and various appliances.
In an alternating current (AC), both the direction and the magnitude of the current vary sinusoidally with time. This is the key characteristic of AC, as opposed to direct current (DC), where the current flows steadily in one direction with a constant magnitude. The change in direction and magnitude of AC is what enables it to be used efficiently in power distribution systems, transformers, and various appliances.
Information Booster:
- AC is represented mathematically as I=Isin(ωt), where I0is the peak current, and ω is the angular frequency.
- The sinusoidal variation of AC provides an average value of zero over a full cycle, which differentiates it from DC.
- AC frequency in most countries is 50 Hz, whereas in the USA, it is 60 Hz.
- AC can be easily transformed to higher or lower voltages, making it suitable for long-distance power transmission.
- Common sources of AC are generators and alternators.
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