Alternating Current or Alternating Voltage

Alternating Current or Alternating Voltage is that which changes its magnitude instantaneously with a change of direction at definite interval of time

Where

v-instantaneous value of alternating voltage

Vo-Maximum Value of alternating Voltage

I-instantaneous value of alternating Current

Io-Maximum Value of alternating Current

Ѡ-angular velocity

Cycle

A complete set of positive and negative instantaneous values of the alternating quantity is called Cycle

Frequency

Number of cycles per second is called frequency. Its units is hertz (Hz)

Time period

The time required for one cycle is called time period

Advantage of AC over DC

High Voltage can be generated easily using AC generator whereas ,DC generator generating voltage is limited to few 100 V

Voltage level of ac can be changed easily with help of transformer AC motors are cheaper when compared to Dc motors AC transmission Is more efficient