Question

Which of the following are advantages of AC over DC?
A. Easily stepped up and down for long transmission with fairly low loss.
B. Easy to generate with an AC generator/ motor from rotary sources.
C. Easy to make powerful, reliable motors (induction type).
D. All of the above

Answer 1

Electric current flows in two forms: alternating current (AC) and direct current (DC) (DC). In alternating current, the current alternates between forward and reverse flow. In the case of direct current, it flows in a single direction indefinitely. The primary distinction between AC and DC is the direction in which electrons move. In DC, electrons flow constantly in a single direction, whereas in AC, electrons alternate between forward and backward motion.

Complete answer:
Advantages of alternating current over direct current:-
- AC is less expensive to produce than DC.
- Using a choke wire, the magnitude of AC may be easily reduced without losing surplus energy.
- AC is easily converted to DC.
- AC generators are more efficient than DC generators.
- The use of transformers yields a wide variety of voltages.
- ACs have been shown to be safer for humans than DCs.

Hence, the correct option is D.

Note: It is necessary to keep in mind that batteries do not directly store energy. They conserve electrical energy by storing it in the form of chemical energy. The positive terminal of an alternating current source is linked to the positive terminal of the battery, and the negative terminal of an alternating current source is connected to the negative terminal of the battery. The flow of current begins. However, alternating current (AC) reverses its polarity, and there is no true supply of energy. This is due to the fact that the positive half cycle cancels out the negative half cycle. If this procedure continues, the battery may be damaged. As a result, AC is not stored in batteries.