# TF EIM Chapt2

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# Alternating Current (AC)

Thus far we have discussed direct current circuits which were built from a battery (constant voltage supply).

Another type of circuit is one in which the current is driven in an alternating fashion. Typically the current is increased so some positive maximum value, then decreased until it passes through zero and reverses direction until it reaches another maximum value and then it is decreased again, passing though zero once more on its way to a positive maximum value.

## Defniitions

- frequency ( , )
- The frequency is number of complete cycles which occur in 1 sec (cycles/sec = Hz)
- Angular frequency = = radians/sec
- Period
- The period is the time to complete one cycle = 1/

- Amplitude

- phase