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# Descriptions of AC electrical circuits

For DC circuit V/I = R

For AC circuits V/I = Z

Here Z is impedance.

# The R branch:
This is a simple ac circuit shown in figure from simple circuits.
For voltage

V = iR
Or, iR = Vm Sinwt

Or, i = Vm Sinwt / R

For current,

Im = Vm / R

Or, R = Vm / Im

Or, ZR = Vm / Im = R<0

For resistive branch v and i are in phase.

# Power: Ac power supplies

P = Vi
= Vm Sinwt X Im Sinwt
= 1/2 Vm Im (1-Cos2wt)
= 1/2 Vm Im – 1/2Vm Im Cos2wt

##### Md Ebrahim Shah

Electrical Engineer, teacher, professional article writer and founder of engineersblogsite.com. His passion is to describe electrical technology at easy way as people can get clear conception and upgrade the technology for the better human life.

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