Alternating Current

**Alternating Current (AC)**

Alternating current is an electric current whose magnitude changes with time continuously and which reverses its direction periodically. It is mathematically represented as

$I={I}_{\mathrm{o}}\mathrm{cos}\omega t\mathrm{or}I={I}_{\mathrm{o}}\mathrm{sin\omega t}$

**Advantages of AC over DC**

- Flexibility of converting from one value to other using transformer
- Can be transmitted over long distances economically as well as without much power loss

**Mean Value or Average value of AC (…**

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