# Power in a AC Series LCR Circuits.

#### asimbhawsinghka

Joined Aug 2, 2007
7
After pondering for few hours over the power triangle in a series LCR circuit, i came to realise that the various sides of the triangle, represnting the powers, viz. active power, reactive power and apparent powers are basically powers of purely resistive circuits with resistance values the same as that of the impedence values as that of the various components of the LCR circuits. Am correct in visualizing it?????

#### chesart1

Joined Jan 23, 2006
269
After pondering for few hours over the power triangle in a series LCR circuit, i came to realise that the various sides of the triangle, represnting the powers, viz. active power, reactive power and apparent powers are basically powers of purely resistive circuits with resistance values the same as that of the impedence values as that of the various components of the LCR circuits. Am correct in visualizing it?????
At the resonant frequency, the inductive reactance and the capacitive reactance cancell each other out. You are left with pure resisitance. At all other frequencies, you will have some reactance.

#### Dragon

Joined Sep 25, 2007
42
... active power, reactive power and apparent powers are basically powers of purely resistive circuits with resistance values the same as that of the impedence values as that of the various components of the LCR circuits. Am correct in visualizing it?????
You are not exactly correct about it. REAL & REACTIVE powers are used to differentiate between the type of LOAD at the ouptut, which can be purely resistive, inductive, capacitive or a combination of these.

REAL POWER - For purely resistive loads.
REACTIVE POWER - For inductive/capacitive loads.
APPARENT POWER - It is the vector sum of real and reactive power.

A practical load will have resistive, inductive, and capacitive parts, and so both real and reactive power will flow to the load.

Reactive power indicates whether power is being transferred to the load from the source, or from the load back to the source.